I upgraded Kubuntu from 15.10 to 16.04 today using the official upgrade process. The upgrade was smooth: no errors at any point during the process.
However, after rebooting, X.org fails to start up. The screen keeps "flashing" between trying to start xorg and failing (when it fails, I get thrown back to vt1). This keeps happening forever.
Here's the Xorg.0.log
I pulled using a livecd: http://paste.ubuntu.com/15987227/. I see some segfaults in there, but I'm not sure how to read or analyse them.
My system is a Sony Vaio laptop with an intel and nvidia card (optimus setup). Currently, nvidia proprietary drivers are installed for occasional gaming. I'll update the post with lspci output shortly.
What I've tried till now:
- deleting
/etc/X11/xorg.conf
so that it can be regenerated - changing the active screen in
xorg.conf
tointel
and markingnvidia
asInactive
- removing all unnecessary config files from
/etc/X11/xorg.conf.d
Nothing has worked, and I'm still stuck in an xorg crash loop.
Edit: Some more system info:
lspci -vvv
from livecd: http://paste.ubuntu.com/15987712/- Default
xorg.conf
that's generated: http://paste.ubuntu.com/15987762/- this is where I had switched out
nvidia
andintel
inServerLayout
section
- this is where I had switched out
nvidia-*
andbumblebee-*
packages, the system booted up fine.nvidia-361
andnvidia-prime
, and then usingnvidia-settings
to disable the nvidia card did the job for me. You might notice KDE doesn't have any desktop/window effects after doing that. To fix it, you need to go into system settings -> Display/Monitor -> Compositor and switch the rendering backend to OpenGL 3.1.