I upgraded to Ubuntu 15.04 which was just released. After reboot, I get as far as the login screen but it only appears for a second, then it goes to an infinite loop of screen flickering. How could I fix it?
Here is a video of what I'm seeing: https://youtu.be/NCtCw267v8Y
(The tag "Nvidia" is added to this question as that is, or at least was, my graphics driver.)
Note that switching to upstart
does not fix this, nor am I able to enter the command line with ctrl+alt+f2
.
Update: when I boot with recovery mode, /var/log/Xorg.0.log
is empty, and I can at least enter my password (which in normal mode is impossible) but then it starts the same flickering, see this second video recording: https://youtu.be/AdOqBKPnUKA
Valid workaround: go to recovery mode, open a root shell, get list of relevant packages with dpkg -l | grep -i nvidia
and remove them all with apt-get remove --purge [package]
(for me, they were versions 340 and 331 while the one nvidia itself recommends me - 350 - is not in any ubuntu package)
Solution: upgrade your kernel like this.