IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 29 August 2015   (all times are UTC)

00:04
<dgroos>
Hi! Holed up in my classroom with a desperate attempt to get my ltsp-pnp setup to function. Have twice today run a fresh install of ubuntu 14.04.3 on the same PC I had it working on 12.04 last year.
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00:07
<dgroos>
Amazingly enough, even with a fresh install, then going to alkisg's https://help.ubuntu.com/community/UbuntuLTSP/ltsp-pnp help page and carefully cutting and pasting of the commands I get all the way until...
00:08
... ltsp-update-image --cleanup / (run as root) and it doesn't run! Each time I get this error: http://pastebin.ubuntu.com/12218688/
00:08
As you can imagine, I've done plenty of googling but to no success :-(
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00:10
<dgroos>
Please feel free to throw-out any ideas!
00:36
The first line of the error message linked above is: root@southsci1:~# ltsp-update-image --cleanup /mount: wrong fs type, bad option, bad superblock on overlayfs, missing codepage or helper program, or other error
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00:38
<maldridge>
dgroos: if I had to guess, you are missing a filesystem compatibility package of some kind
00:38
<dgroos>
maldridge: Thanks for engaging!
00:39
I checked that out as per this page: http://askubuntu.com/questions/525243/why-do-i-get-wrong-fs-type-bad-option-bad-superblock-error
00:40
and tried to install some of the helper programs. That was a couple of days ago and 3 ubuntu reinstalls ago.
00:41
<maldridge>
you have installed nfs-common and the error persists
00:41
<dgroos>
let me check...
00:42
nope... installing now...
00:43
do I need a reboot after install? I installed and again tried: ltsp-update-image --cleanup / and get the same error message.
00:43
[!brb!]
00:43
<maldridge>
shouldn't need to reboot
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00:45
<maldridge>
dgroos: does the file its trying to mount actually exist?
00:54
<dgroos>
maldridge: um, how do I find out? Not sure which that is. All I know is that the ltsp-update-image in the ltsp-pnp system creates an image of the server for the clients to PXE-boot to.
00:57
<maldridge>
so the last line of that error had a file in /tmp
00:57
did that file actually exist at that location
00:59
<dgroos>
I cd to /tmp and did ls -la and there is no, tmp.* in there. That's a problem I guess...?
01:00
<maldridge>
do you have a gui?
01:00
(on the server)
01:00
<dgroos>
yes, I'll check via the gui...
01:01
don't see any tmp.anything in there...
01:03
<maldridge>
so, lets try this
01:03
get two terminals up
01:03
(this is why you need the gui)
01:04
<dgroos>
k :-)
01:04
<maldridge>
in one run "watch -n 0.1 ls /tmp"
01:04
in the other, try to update the ltsp image
01:04
<dgroos>
sudo?
01:04
<maldridge>
no sudo on the first one
01:06
<dgroos>
wow! there was a quick flash of a few lines in the watch... terminal, right where a file with the letter "t" would appear... but then it was gone, yup, tried again, got the same results.
01:06
<maldridge>
huh, so it seems like it is creating the file, it just can't mount it
01:08
<dgroos>
This is on a fresh install, that's what I don't get. Did a normal ubuntu install, for partitioning chose the "erase the disk then reinstall 14.04.3" option.
01:10
<maldridge>
if you can wait a few, I can go remote into one of my installs and see if this is an issue with the latest ubuntu
01:11
<dgroos>
Thanks!
01:11
<maldridge>
doubtful, but not impossible
01:11
<dgroos>
Sure... also just writing...
01:11
You know when this error first started to appear? That was 3 installs ago with me set-up server when I was trying to solve the https://bugs.launchpad.net/ltsp/+bug/1352038 problem...
01:12
it happened for the first time after I tried this fix: https://bugs.launchpad.net/ltsp/+bug/1352038/comments/3
01:13
but that can't still be affecting things since I've re-re installed since then? Could it?
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01:23
<maldridge>
no, a wipe would clear any artifacts from an old install
01:24
<dgroos>
thought so...
01:25
is there anything about the NIC's or my network configuration or the school's configuration that could cause something like this? It's a new school year so maybe extra blocks-etc have been put into the firewall.
01:26
<maldridge>
no, this is definitly a local issue on the server itself
01:27
<dgroos>
OK. Could there be some issue on this particular HD? The error said something about a possible bad superblock but I figured if the computer seems to be working fine it probably isn't that... RAM?
01:28
I'm clutching at straws... That's why I thought maybe it might (however unlikely) be a prob with the new version of 14.04.3...
01:31
<maldridge>
so at that point in the install, its created a temporary disk and tries to mount it in order to install the actual system to it
01:31
the error you're getting is that it can't mount the temporary disk to complete the install
01:32
<dgroos>
that makes sense.
01:32
<maldridge>
dunno why you'd be getting it though
01:33
hmm, I'm not able to immeadiately duplicate that issue, but it doesn't look like this particular host is using the pnp method
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01:34
<dgroos>
thanks for trying!
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01:34
<maldridge>
this is an interesting issue, lemme look at something real quick
01:36
ok, I've got a spare box spinning up and I'm going to run the install here, are you on 64 bit or 32
01:36
<dgroos>
hardware is 64 and it's running a 32 as per the ltsp-pnp directions.
01:37
<maldridge>
ok, I'm running 64 as that's the image I had, but shouldn't be too different; can you link your guide
01:38
<dgroos>
https://help.ubuntu.com/community/UbuntuLTSP/ltsp-pnp
01:40
<maldridge>
hmm, I don't get that error at all
01:40
I'm perplexed
01:40
<dgroos>
?!
01:41
yes...
01:41
Is it a fresh 14.04.3?
01:42
<maldridge>
fresh with one or two local packages inserted in
01:42
nothing that could affect this though
01:43
<dgroos>
how could this be? I've gotten it on 2 straight fresh installs, and specifically this last one I did nothing else but the ltsp-pnp page...
01:43
<maldridge>
I'm going to go ahead and spin up a box from an installer instead of an image and see if this happens there
01:43
<dgroos>
I'm tempted to do a 12.04 lts install...
01:43
OK thanks!
01:56
<maldridge>
just to be sure, you have squashfs-tools installed, right?
01:58
<dgroos>
yes
02:00
<maldridge>
hmm, at this point I'm completely out of ideas
02:01
best I've got would be to ask work_alkisg, this is deeper into ltsp than I am familiar
02:01
<dgroos>
maldridge: Thank you very much for trying.
02:01
it's 9 pm and I'm pretty sure the custodians are going to kick me out pretty soon anyway.
02:02
That's good advice. I can access remotely. Have a good evening!
02:02
<maldridge>
you too
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18:42
<dgroos>
Hi — can anyone familiar with the inner workings of ltsp-pnp help me figure why I get http://paste.ubuntu.com/12224687/ when I run sudo ltsp-update-image --cleanup /
18:43
<maldridge>
ah, back at it on a saturday I see
18:43
<dgroos>
I get this error when following work_alkisg page, “https://help.ubuntu.com/community/UbuntuLTSP/ltsp-pnp” right after a fresh install of 14.04.3. Keep getting this problem—have done 2 fresh installs yesterday!
18:43
maldridge: yup :-)
18:44
ssh’ing into server from home…
18:46
The first week of our physical science class just passed and no access to the computers! they’re just sitting there :-(
18:47
<maldridge>
ah, year has already started for you then
18:48
<dgroos>
true…
18:49
<maldridge>
dgroos: curiosity, which install media are you using
18:51
<work_alkisg>
dgroos: 14.04.3 has a newer kernel than 14.04.1, which you previously had installed, and thus a newer kernel, that's why you're having the issue
18:51
<dgroos>
Well, the first first reinstall was via a flash drive, the next 2 were via a dvd I had burned from the iso. (yeah, so actually 3 fresh installs in the last 3 days.
18:51
<work_alkisg>
You can either install the normal 14.04 kernel, not the hwe stack,
18:52
or download the ltsp-update-image from launchpad
18:52
But you need to download the specific revision where I had fixed the issue, because later on they reverted the fix
18:52
Don't download its latest version
18:53
<dgroos>
work_alkisg: OK—this is with a fresh install I did yesterday with the 14.04.3? I made sure I put the /boot on the same partition as everything else…
18:54
<work_alkisg>
It's not the /boot problem it's another one
18:55
!overlayfs
18:55
<ltsp`>
overlayfs: Overlayfs was mainlined in Linux 3.18+, so this (http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ltsp-trunk/revision/2639) LTSP commit is required, but missing from some distributions like e.g. Ubuntu 15.xx.
18:55
<dgroos>
Ah! I didn’t get that far in my brain…
18:55
<work_alkisg>
So you either need linux < 3.18, or that ^ patch
18:56
<dgroos>
where can I get the proper patch for the fresh install I did yesterday (14.04.3)?
19:00
<work_alkisg>
dgroos, you did see the patch I linked above, right? That's the one you need...
19:01
<dgroos>
I went to the page and it says, “files modified:” then lists 2…
19:01
I click on one of the two (…hooks/ltsp) and… not sure what this all means, sorry.
19:02
<work_alkisg>
That's the file involved: http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ltsp-trunk/view/2648/server/ltsp-update-image
19:02
Replace your ltsp-update-image with that one, it should fix both issues, the /boot (which you no longer have) and the overlayfs one
19:03
<dgroos>
Cool, I can do that :-)
19:03
Thanks!!!
19:03
<work_alkisg>
np, unfortunately the fix was reverted and I have to re-commit it some time in the future...
19:08
<maldridge>
huh, any idea why it was reverted?
19:12
<work_alkisg>
vagrantc fixed the /boot issue in a better way, but he didn't see that I solved other issues in that commit, so it was by mistake...
19:18
<dgroos>
work_alkisg: I replace the ltsp-update-image, fixed permissions, ran sudo -i and then ltsp-update-image —cleanup / and get this error message:
19:18
Should I reboot the computer?
19:20
… and get this: http://paste.ubuntu.com/12224884/
19:20
<work_alkisg>
dgroos, you downloaded the web page instead of the file
19:20
<dgroos>
:-P
19:20
<work_alkisg>
Use a browser to download it :)
19:20
<dgroos>
:-)
19:20
<work_alkisg>
Not wget, launchpad is a bit non intuitive there...
19:26
<dgroos>
that’s looking more like it :-)
19:26
<work_alkisg>
:)
19:35
<dgroos>
just finished—successfully—building! Is there any way I can check if this will work remotely? I’m about to install Mate base and x2go. I could make a virtualbox setup… seems I did something like this in the distant past…
19:36
<maldridge>
dgroos: depends, can you get a network connection to the PXE side of the box remotely?
19:38
<dgroos>
Right, can’t do that. I’ve got a 2 NIC set up (one to WAN other to classroom LAN) but only have 1 cord plugged in at this time.
19:38
<work_alkisg>
yup, virtualbox or kvm
19:39
!kvm
19:39
<ltsp`>
kvm: Virtual thin client: kvm -vga-vmware -ctrl-grab -no-shutdown -net nic,model=virtio -net user,tftp=/var/lib/tftpboot,bootfile=/ltsp/i386/pxelinux.0
19:39
<dgroos>
!virtualbox
19:39
<ltsp`>
Error: "virtualbox" is not a valid command.
19:39
<work_alkisg>
You're about to install mate *after* ltsp-update-image?
19:39
<dgroos>
:-)
19:39
<work_alkisg>
Why didn't you use the mate cd?
19:40
<dgroos>
…and a bunch of other stuff…
19:40
Well, not sure how the different flavors work. I’m using Mate because that’s required to use x2go—doesn’t seem to work otherwise (including fallback).
19:41
<work_alkisg>
I don't understand why you're "about to install mate"
19:41
<dgroos>
so I should have installed with a Mate CD? Does this matter?
19:41
<work_alkisg>
If you used the ubuntu-mate cd, then mate is already installed
19:41
Well, in theory multiple DEs are supported
19:41
<dgroos>
No, I didn’t use the ubuntu-mate cd.
19:41
<work_alkisg>
In practise, not everything goes as planned, so if someone is only using one DE, it's better to only have that one installed
19:42
flashback should be working fine with x2go, unless some minor bug came up in recent versions...
19:42
<dgroos>
The only x2go that’s working w/14.04 is with Mate.
19:42* work_alkisg isn't using 14.04 because ubuntu has introduced an issue with the keyboard layout
19:42
<dgroos>
I could only get w/Mate to work. What do you recommend?
19:42
<work_alkisg>
For now, ubuntu 12.04... :)
19:43
(+flashback)
19:43
Later on I'll try to get better support for mate
19:43* work_alkisg needs to go for now, cheers!
19:43
<dgroos>
Thanks again :-)
19:43
bye
19:43
<maldridge>
'later
19:47
<dgroos>
hmmm… I’m thinking the best use of time at the moment is work on curriculum and give the boot test on Monday!
19:48
Thanks again maldridge !
19:51
<maldridge>
eh, alkisg actually solved it
19:51* maldridge files this issue away under "arcane kernel problems"
19:52
<dgroos>
Yeah, he has spent a lot of time helping out.
19:53
seems like that other bug wasn’t documented yet?
19:53
<maldridge>
probably was, but not anywhere I found it
19:54
<dgroos>
Yup. Well I’m feeling better—there’s hope things will work again :-)
19:55
Taking off now! Have a great weekend :maldridge
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