IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 17 May 2017 (all times are UTC)
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| 05:51 | <alkisg> ogra_: does ubuntu offer any packages to run android emulator? E.g. http://packages.ubuntu.com/xenial/android-emulator ?
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| 05:51 | I see a lot of transitional packages, and I'm not sure if some of them are abandoned...
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| 05:52 | End goal is to run e.g. an android game inside ubuntu... so I'm looking to set up the official android emulator with graphics acceleration...
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| 05:53 | E.g. this one (http://www.webupd8.org/2014/09/canonical-releases-ubuntu-developer.html) says: udtc android
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| 11:18 | <bcg> thanks for switching to git!
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| 14:52 | <TheProf> Hello. I hope everyone is very well. I set up a new LTSP server (2 NIC, LTSP on top of Ubuntu-Mate 16.04) and I am having a strange problem where only a few of my users can log in. The specifics steps I went through are:
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| 14:54 | 1) Set up a temporary Ubuntu 16.04 LTSP Server and moved everyone over - the school has been running on that for 2 months no problem. 2) Did a clean install on the main server to Ubuntu-mate 16.04 + LTSP. During the installation the OS recognized the /home partition and kept it as is. Everything else was wiped.
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| 14:55 | 3) Rsync'd /home from the temporary server to the newly-formatted server and then tried to test some users. 4) Ran a script that deleted ALL the config files and directories from everyone's home folders. Basically anything that had a '.' in front of it was deleted. Only the actual documents were retained.
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| 14:56 | 5) Tried to log in, but only a very few users can log in. The rest accept the username and password, start the desktop loading process and then the login screen re-loads. It is not a password issue. When I look in the directory of a failed user, I see a newly created file called .xsession-errors.
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| 14:57 | Inside that file is Xsession: X session started for testuser at Mon May 15 10:34:32 EST 2017
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| 14:57 | localuser:testuser being added to access control list
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| 14:57 | openConnection: connect: No such file or directory
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| 14:57 | cannot connect to brltty at :0
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| 14:57 | /etc/X11/Xsession: 3: [: x: unexpected operator
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| 14:58 | I have tried changing the hardware on the fat client but same issue. How can I solve this please?
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| 16:56 | <alkisg> TheProf: try logging in with the xterm session
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| 16:56 | From there, then run the mate session, so that you see all the error messages
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| 16:57 | <TheProf> alkisg: Hello. Thanks for responding. Do you mean to set the fat client to boot up to a command line when you say xterm session?
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| 16:58 | <alkisg> I mean to go to the preferences -> session menu, on the ldm login screen
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| 16:58 | And select the terminal session from the combo box there
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| 17:00 | <TheProf> OK. I understand. Thank you.
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| 17:01 | alkisg: I'm not at the school currently but I will try it once on-site. Do you have any clue what could cause this?
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| 18:31 | <alkisg> TheProf: about clues => probably something you did, e.g. wrong permissions in the copy
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| 18:31 | Wrong UIDs, wrong ACLs, whatever
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| 18:32 | It doesn't sound ltsp-related
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| 18:32 | <TheProf> alkisg: I understand. You are right since a couple of users can successfully log in. I will follow your recommendation and report back. Thanks.
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| 18:34 | <alkisg> All new users can successfully login, right?
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| 18:34 | <TheProf> alkisg: no actually we tried to create a new account but they could not log in
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| 18:34 | I had run a script that corrected everyone's permissions so they own their own files / folders.
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| 18:34 | <alkisg> Are you using something ldap-related?
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| 18:34 | <TheProf> I am not.
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| 18:34 | <alkisg> OK, but that script shouldn't affect new users, right?
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| 18:35 | Since new users are supposed to already own their home dir
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| 18:35 | <TheProf> No it was a one-time script. And yes that is right. And even the failing users seem to own their own script since they're writing error logs into it.
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| 18:35 | And they create .<something> directories when they fail to log in
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| 18:36 | <alkisg> Do you know where that openConnection error comes from?
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| 18:36 | <TheProf> I'm wondering if it is a UID issue since they have the same username, groupname, and passwords but I think different actual UID numbers.
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| 18:36 | <alkisg> Or which dir is that non-existing one that it reports?
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| 18:36 | ls -lha /home should tell you
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| 18:37 | <TheProf> When I googled the error I only saw results about video card issues but I am not using those video cards.
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| 18:37 | <alkisg> It should list all home dirs as owned by user:user
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| 18:37 | <TheProf> I can ssh in and check now
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| 18:37 | <alkisg> Did you say that you can successfully login to the server using those users?
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| 18:37 | (graphically)
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| 18:38 | <TheProf> Yes I can log in directly at the server with those users that fail at the fat clients
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| 18:38 | Hence why I was wondering if it may be LTSP related.
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| 18:38 | <alkisg> Are you using ltsp-pnp, or do you have a chroot?
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| 18:38 | <TheProf> I have chroot.
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| 18:39 | <alkisg> Did you add any users in the chroot?
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| 18:39 | <TheProf> I did not.
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| 18:39 | <alkisg> Did you clone or copy the chroot from somewhere else, so as the permissions could be wrong due to bad copy?
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| 18:40 | <TheProf> I only copied /home. chroot was built from scratch before rsycning /home
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| 18:40 | <alkisg> And it's a fat chroot with mate in it?
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| 18:41 | <TheProf> Yes.
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| 18:41 | <alkisg> Let's say user1 can login to pc1, and user2 cannot login to pc2
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| 18:41 | Can user1 login to pc2?
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| 18:42 | Can user2 login to pc1?
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| 18:42 | <TheProf> I will need to test that. I only set up one server, a switch, and one fat client hardware.
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| 18:42 | <TheProf> I swapped out the pc1 for alternate pc2 and it also failed
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| 18:42 | But I didn't try different users on different machines
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| 18:43 | ls -lha /home shows me each user owns their own home directory.
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| 18:43 | <alkisg> Can you put your lts.conf to pastebin?
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| 18:43 | <TheProf> so it's testuser testuser /home/testuser for example.
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| 18:43 | Sure.
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| 18:44 | <alkisg> One thing that I can think of, is if that pc has graphics driver issues, and can work with marco --no-composite, but not with marco --composite, and if user1 has selected a non-compositing window manager
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| 18:44 | <TheProf> !pastebin
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| 18:44 | <ltsp> pastebin: try !paste
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| 18:44 | <TheProf> !paste
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| 18:44 | <ltsp> paste: the LTSP pastebin is at http://ltsp.pastebin.com. Please paste all text longer than a line or two to the pastebin, as it helps to reduce traffic in the channel. Don't forget to paste the URL of the text here.
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| 18:44 | <alkisg> And another one, is if user1 has a .dmrc with the wrong session in it
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| 18:44 | !termbin
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| 18:44 | <ltsp> termbin: To share the output of some command, run: command | nc termbin.com 9999 . This executes command , sends its output to termbin.com, and returns a URL. Paste this URL here to share the command output with us.
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| 18:44 | <alkisg> E.g. cat lts.conf | nc termbin.com 9999
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| 18:45 | ...or whatever else suits you
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| 18:46 | <TheProf> None of the users have .dmrc or any . files at all
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| 18:46 | They were the first thing removed as soon as rsync was done. I didn't want a conflict so I deleted them all before trying to log anyone in
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| 18:47 | <alkisg> If you have access to the server, you can also test things with virtual thin/fat clients
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| 18:47 | E.g.
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| 18:47 | !kvm
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| 18:47 | <ltsp> kvm: Virtual thin client: kvm -m 256 -vga vmware -ctrl-grab -no-shutdown -net nic,model=virtio -net user,tftp=/var/lib/tftpboot,bootfile=/ltsp/i386/pxelinux.0
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| 18:47 | <alkisg> Without having to go there and boot an actual client
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| 18:47 | <TheProf> Oh now that's cool. I didn't know that. That needs to be more well know.
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| 18:48 | <alkisg> It's called "virtual machines", there's kvm, virtualbox, vmware...
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| 18:48 | LTSP can't make them more known :)
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| 18:50 | <TheProf> I know of them but didn't know they can be used with LTSP. Of course I'm a biologist so I am already stretching my knowledge as is!
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| 18:50 | https://pastebin.com/p7rEQihw
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| 18:50 | <alkisg> You're doing very well then, if you're not an IT teacher :)
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| 18:50 | (like myself ;))
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| 18:51 | (09:36:42 μμ) TheProf: I'm wondering if it is a UID issue since they have the same username, groupname, and passwords but I think different actual UID numbers.
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| 18:51 | I'm not sure what you mean there
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| 18:51 | You have many users with the same username?
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| 18:51 | <TheProf> No sorry let me clarify
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| 18:54 | <TheProf> on the old server user testaccount had a number 1044 but on the new server they have a number 1057
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| 18:54 | <alkisg> That's ok; since you're saying that it happens with new users, we don't really need to check old/transferred accounts at this point
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| 18:55 | <TheProf> for the same user. Same spelling, password, etc. just some of them have a different number.
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| 18:55 | OK
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| 18:55 | <alkisg> But the lts.conf that you put to pastebin was only half of it; try the nc command instead
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| 18:55 | cat lts.conf | nc termbin.com 9999
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| 18:55 | <TheProf> I thought it was the whole thing. I'll use nc now
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| 18:56 | <alkisg> If you have passwords there, send me a pm
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| 18:56 | Don't send it in the channel then...
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| 18:56 | <TheProf> No passwords. it is fairly generic
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| 18:57 | <alkisg> k
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| 18:58 | <TheProf> http://termbin.com/v60h
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| 19:00 | <alkisg> Strange, it's again cut in half
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| 19:00 | <TheProf> It's not - that's the whole file
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| 19:00 | There's nothing else.
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| 19:00 | I deleted some of the commented out lines
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| 19:01 | I have a backup of it before I deleted the commented lines if that helps
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| 19:01 | <alkisg> It's a standard lts.conf, from lines 3 to 15, while lines 1-2 and 16+ are missing
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| 19:01 | But ok if you manually deleted those, it's fine
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| 19:01 | <TheProf> Yes I just deleted the parts about old monitors, local printing, etc.
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| 19:02 | <alkisg> Do you have graphical access to the server? Can you try virtual fat clients etc?
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| 19:02 | <TheProf> I will try that now.
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| 19:02 | <alkisg> ok
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| 19:03 | <TheProf> To run that kvm command am I running it from my remote ssh client on the server or?
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| 19:04 | <alkisg> hmm not exactly
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| 19:04 | ssh is terminal, it can't run graphics
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| 19:04 | One proper way to do it is to use x2go
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| 19:04 | Another one would be to use epoptes
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| 19:04 | A third one, to use ssh -X
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| 19:04 | <TheProf> I have x2go working on the server
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| 19:04 | <alkisg> Login with x2go then, and do it from there
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| 19:08 | <TheProf> OK I'm trying it now. I thought x2go was creating a session on the server and so would be the same as standing at the server rather than booting a thin client
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| 19:10 | <alkisg> Exactly, and you need to "stand on the server" before you run a "virtual thin client" with kvm
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| 19:10 | <TheProf> Ah OK. So a session within a session within a session. This is like session Inception :)
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| 19:11 | <alkisg> Haha
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| 19:11 | Now, suppose I was helping you do that
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| 19:12 | I'm connected from ubuntu with vnc to ubuntu and I would use epoptes to control your ...inception story
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| 19:13 | <TheProf> My Internet connection can barely handle irc. It cringes at that. It's still loading
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| 19:13 | OK it's up.
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| 19:14 | so I'm running that kvm command from where?
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| 19:14 | <alkisg> Open a terminal inside that x2go session
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| 19:15 | And run it from there
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| 19:15 | You might need to install kvm if you don't have it installed
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| 19:15 | Or you can use virtualbox if you already have it installed
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| 19:15 | (kvm if lighter than vbox, if you don't have any of those)
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| 19:16 | <TheProf> installing kvm now
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| 19:25 | <TheProf> alkisg: finished installing kvm - running the command now
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| 19:27 | Hmm..doesn't like kvm. Could not access KVM kernel module: No such file or directory
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| 19:27 | failed to initialize KVM: No such file or directory
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| 19:28 | <alkisg> TheProf: eh, that means that you have virtualization disabled in bios
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| 19:28 | <TheProf> If I just run 'kvm' it goes that same error.
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| 19:29 | Ah. OK.
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| 19:29 | <alkisg> You could run virtualbox, which uses emulation mode...
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| 19:29 | <TheProf> OK I can install it unless there was a negative?
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| 19:31 | <alkisg> it compiles some kernel modules but nothing significant, sure, you can install it
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| 19:33 | <TheProf> Sure - installing now
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| 19:45 | <TheProf> alkisg: Installed! That was quite the install. OK
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| 19:45 | Is it the same command but with virtual box in front?
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| 19:46 | <alkisg> No, that one uses a gui
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| 19:46 | You care a new client, you put it to bridge mode and then you run it
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| 19:46 | You open it from the menu
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| 19:47 | TIme for me to go though; good night all...
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| 19:47 | * vagrantc waves | |
| 19:47 | <TheProf> alkisg: Just when it was getting good! Thank you for your help.
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