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On 04/30/2012 08:15 AM, Angus Gratton wrote:
> Hi everyone,

Hi,

> I'm a long-time LTSP user and fan. I recently decided to upgrade 
> our work LTSP system to 12.04 LTS, especially enticed by promises
> of improved fat clients in 5.3.
> 
> Unfortunately, things haven't gone that smoothly. I'm not sure if
> I'm running what amounts to unsupported configuration, or if I'm
> just doing something wrong...
> 
> This is all working from fresh-built fat client images, built with
>  ltsp-build-client --fat-client --arch <arch> --mirror <mirror>
> 
> ... for both amd64 & i386 (same problems observed on both.)
> 
> Host system was dist-upgraded from a previous Ubuntu version.
> 
> 
> * Logging into Unity ("Ubuntu session", aka the default session),
> Unity fails to load. The desktop renders (I believe this is
> Nautilus) but no Unity top menu or sidebar launcher. You get stuck
> with any pre-existing desktop icons, and the Nautilus context
> menu.

Hmm, that's rather weird. I have a very similar known bug for the thin
client mode: https://bugs.launchpad.net/ubuntu/+source/ldm/+bug/987726

But the cause of this one is assumed to be a failure in
unity_support_test to detect 16bit color mode and fallback to 2d (as
compiz doesn't support 16bit).

In your case, as you're running your machine as a fat client, X is
supposed to be in 24bit mode which shouldn't hit that particular bug.

Can you check if X was called with a config file and if it was, what
that config file contains? I'd like to ensure we don't end up starting
fat clients in 16bit mode...

I'm currently 7000km away from my LTSP test setup, but hope to have
some time to investigate later this week or when I get back from the
Developer Summit mid-May.

> .xsession-errors contents can be seen at 
> http://pastebin.com/raw.php?i=J44kex4B (that's the very first login
> attempt on a brand new user account, I get the same symptoms on
> pre-existing accounts.)
> 
> Here's the output from pstree at this point[1]: 
> http://pastebin.com/raw.php?i=5Uq9shdm
> 
> Unity runs fine if I boot this same machine from a 12.04 Live USB
> key (and "/usr/lib/nux/unity_support_test -p" outputs all "yes"
> values.) I also tested on a second Unity-supported machine (newer
> model) and got the same results.

I added these to the bug anyway, in case that helps later on.

> 
> * Switching sessions to unity-2d (aka "Ubuntu 2D"), Unity 2D
> loads.
> 
> It works fine on new accounts, on any pre-existing account I found
> I needed to delete the "~/.local/share/zeitgeist" directory before
> the Launcher would work at all (search results were always empty
> for all types of search, so you couldn't launch anything!) This is
> probably a Zeitgeist issue not an LTSP issue, but I thought it was
> worth mentioning just in case anyone else has come across it.

Indeed sounds like a zeitgeist bug, might be worth looking for
it/reporting it on Launchpad if you have some time.

> * There's a GNOME session option but it just pops up with "Failed
> to load session 'gnome'". I'm guessing not all GNOME session
> packages are installed by default? Any tips on how to get a GNOME
> fat client? ('apt-get install gnome' seemed like it might break
> other things.)

That session indeed won't work, I think the reason why it shows up at
all is a bug in ldminfod that doesn't understand "hidden=true" as a
property in /usr/share/xsessions/gnome.desktop

I opened a bug about it so we get that fixed soon and pushed as an
update to 12.04:
https://bugs.launchpad.net/ubuntu/+source/ldm/+bug/991745

> Any other tips? Should I open any bug reports? Is Unity simply not 
> supported with LTSP?

Unity-2d is supported for both fat and thin clients, Unity-3d should
be working for fat clients but apparently isn't.

> 
> Thanks for any/all help,
> 
> Angus


- -- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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