Bug#819190:

[Bernat Arlandis]

I was having this problem and I think it's solved now.

I was using the current nvidia driver until my graphics card became
obsolete, then I installed the legacy driver and  uninstalled the current
driver. It was left in a broken state after that.

I tried to dist-upgrade or remove the nvidia packages but it failed telling
me to run "dpkg --configure -a". When I tried to do that the command would
hang so I was stuck.. Examining the running processes in another console I
could see it was the /usr/lib/nvidia/check-for-mismatching-nvidia-module
script that hang.

I edited said script putting an exit command at the start of the script so
I could resume dpkg execution, then I purged all nvidia packages and
installed the legacy package succesfully this time.

Questions:
 - what is your Nvidia card (lspci verbose output please)?

01:00.0 VGA compatible controller: NVIDIA Corporation G92 [GeForce 9800 GT]
(rev a2) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. G92
[GeForce 9800 GT] Flags: bus master, fast devsel, latency 0, IRQ 31 Memory
at f6000000 (32-bit, non-prefetchable) [size=16M] Memory at c0000000
(64-bit, prefetchable) [size=256M] Memory at f4000000 (64-bit,
non-prefetchable) [size=32M] I/O ports at e000 [size=128] Expansion ROM at
f7000000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver
in use: nouveau Kernel modules: nvidia

(This is after succesfully removing the nvidia packages, thus the nouveau
driver.)

 - are you on stable, testing or unstable?

Testing.

 - if I understand correctly you have an amd64 installation. Did you add
i368 via dpkg --add-architecture?

Yes. Had nvidia i386 packages installed.

 - did you ever have non-legacy-340xx packages installed?

Yes. I had them until they become incompatible with my card.

 - are you installing from a tty or is yours a laptop with an optimus
system?

It's a desktop system and tried from a gnome terminal and a remote ssh
session.

I hope this helps someone.

Thanks for you support.

Best regards.
-- 
Bernat Arlandis
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