slightly OT: lightdm problem with ubuntu 15.10

John G Heim jheim at
Tue Dec 22 19:08:27 CET 2015

Thanks for the suggestion. Unfortunately, that didnt' help.  I have 2 
almost identical machines. One I installed ubuntu 15.10 on from a cd. 
The other is my fai test machine. They are both Dell Optiplex 760s.

I piped the output from "dpkg --get-selections' to a file on both 
machines and then I did a diff. Then I took the output from diff, 
grepped for lines starting with a less than, and redirected it to a 
file. Then I turned that file into an FAI packages config file. First I 
did a fai softupdate. When that didn't work, I did a complete reinstall. 
So now doing the dpkg and diff again shows no packages on the 
ubuntu-from-cd machine  that aren't also on the fai machine.

Of course, there are a lot of packages on the fai machine that are not 
on the ubuntu machine.

On 12/22/2015 10:24 AM, Robert Markula wrote:
> Hi John,
> that's probably due to a missing package. You could do a standard Ubuntu
> install (from CD or USB drive that is) on the machine in question, print
> the installed packages and then, on the same machine, run a FAI-based
> install, print the installed packages again and compare/diff both
> package lists.
> Cheers,
> Robert
> Am 22.12.2015 um 17:14 schrieb John G Heim:
>> I'm installing ubuntu 15.10 via FAI. Actually, all I did was take a
>> working ubuntu 15.04 config and change the sources.list file so it
>> installs ubuntu 15.10 on selected machines. The beauty of FAI is how
>> easy it is to do something like that. The main problem I'm having is
>> that there is no network or sound icon on the lightdm login screen.
>> And the problem with that is that without sound, the accessible logins
>> don't work. I'm blind myself butsince this is a university, we're
>> legally required to have an accessible login anyway.
>> Anybody have a clue as to why sound wouldn't work in lightdm? I am
>> sorry to ask a question that is a little bit OT but I am just really
>> stumped.
>> My sighted colleague tells me that there is a menu bar at the top of
>> the screen just like in a working ubuntu machine but the sound and the
>> network icons are missing. Logins work though. You get sound after you
>> log in and the screen reader works fine.  I examined the lightdm logs
>> and see nothing meaningful.

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