remove xorg-edgers ppa

[Colin Law]

On 3 October 2015 at 20:03, P. Echols <p.echo926 at gmail.com> wrote:
> Greetings all,
>
> This post has the what at the top and the "why" and background further down.
>
> I am trying to remove / purge the xorg-edgers ppa and revert to supported
> repositories.  Using ppa purge gives this:
>
> patton at XPS-8700:~$ sudo ppa-purge xorg-edgers
> Updating packages lists
> PPA to be removed: xorg-edgers ppa
> Warning:  Could not find package list for PPA: xorg-edgers ppa
>
> My searches suggest that this is because the ppa was installed on version
> 14.04 and I did not remember their stern instruction to use ppa-purge before
> the upgrade.  (Note:  I have absolutely no memory of installing the ppa in
> the first place, or why.)
>
> What apparently happens now is that the package manager has no record of
> anything being installed from the ppa, so there is nothing to "purge."  That
> is demonstrably wrong because of the issue that got me started in the first
> place:
>
> The reason I discovered the problem at all was attemting to install VLC.
> Results were this:
>
> The following packages have unmet dependencies:
>  vlc : Depends: libgles1-mesa (>= 7.8.1) but it is not going to be installed
> or
>                 libgles1
>
> and
>
> patton at XPS-8700:~$ apt-cache policy libgl1-mesa-glx libglapi-mesa
> libgl1-mesa-glx:
>   Installed: 10.6.0~git20150528+10.6.ffd133bd-0ubuntu0ricotz~trusty
>   Candidate: 10.6.0~git20150528+10.6.ffd133bd-0ubuntu0ricotz~trusty

That suggests to me that you still have a trusty repository enabled.
Have a look in your s/w sources and if you can find it then disable it
and run
sudo apt-get update && sudo apt-get dist-upgrade

Colin