Bug#804328: glx-alternative-nvidia: GDM3 exits with "Failed to initialize GLX extension (Compatible NVIDIA X driver not found)"

[Andreas Beckmann]

On 2015-11-07 17:18, Alessio Gaeta wrote:
> In attach the log you requested. Relevant part is right at the file
> head (2015-11-03). The log is in Italian,

somehow I expected this :-)

> but it should be quite simple
> to guess what's happened... :)

and that as well :-)

> Reading the log I can see:
> 
> a) errors about diversions while configuring glx-alternative-mesa
> (0.7.0) (glx group damaged)
> 
> b) right after, the configuration of glx-alternative-nvidia (0.7.0)
> keeps complaining about glx group damaged and then it uses (translated
> in English) "/lib/nvidia to supply /usr/lib/glx (glx) in automatic
> mode" 
> 
> I'm not so expert about glx diversion dance so I cannot help you much,
> but I guess that log confirms that the problem resides in a post-
> install script of glx-alternative-nvidia 0.7.0.

For some reason your nvidia alternative (from nvidia-alternative) had 
disappeared, cascading to glx-alternative-nvidia before it could be 
reinstated, therefore cancelling the bumblebee setting.

Essentially it's reproducible with

update-alternatives --remove-all nvidia
dpkg-reconfigure glx-alternative-nvidia
dpkg-reconfigure nvidia-alternative
dpkg-reconfigure bumblebee-nvidia

more realistic with one dpkg run doing configuration:

update-alternatives --remove-all nvidia
dpkg --unpack /var/cache/apt/archives/glx-alternative-nvidia_0.7.0_amd64.deb
dpkg --unpack /var/cache/apt/archives/nvidia-alternative_340.93-7_amd64.deb
dpkg --configure --pending
dpkg-reconfigure bumblebee-nvidia

(the last command is always to restore the initial state)


Andreas