After an update from Ubuntu GNOME 15.10 to 16.04 my gui completly crashes after GRUB. If I try a normal boot, the gui freezes there, where the LVM needs the password to decrypt the systemdrive.
I can boot into the recoverymode and decrypt the systempartition but then strange things happends.
The gui does not start and tty1 just "flashes" every few seconds. It looks like some process try to start the gui but it does not work.
If I change to tty2 or another tty the "flash" kicks me back to tty7 every few seconds.
ps aux | grep Xorg I see, that the Xorg server is restartet whenever this "flash" happens (PID is increasing every "flash"). I can just stop it by renaming the Xorg binary.
I try to install the driver from Nvidia for my GForce 980TI
but theres an error while building the DKMS Module.
(UEFI Secure boot is deactivated).
Found this thread
Graphics issues after/while installing Ubuntu 16.04/16.10 with NVIDIA graphics
and try the following things:
sudo apt-get purge nvidia-* sudo add-apt-repository ppa:graphics-drivers/ppa sudo apt-get update sudo apt-get install nvidia-364
sudo apt-get purge xorg-* xserver-xorg; sudo apt-get install xorg xserver-xorg; sudo dpkg-reconfigure xorg
sudo apt-get purge ubuntu-gnome-desktop gnome-desktop-environment; sudo apt-get install ubuntu-gnome-desktop
It seems like I have to do a fresh install.