Hi,
I was happily running Ubuntu 18.04 (64 bit) in a VirtualBox VM (Windows 10 being the host), and today I decided to upgrade to 20.04. So after an upgrade check, when Ubuntu told me I could upgrade, I decided to do it, and after the upgrade was done and a reboot, I got the login screen. After logging in, the screen went black. Yay!
I tried to reinstall the VirtualBox guest additions CD. Unfortunately, inserting the drive from VirtualBox doesn't work; shared folders worked, however, so I unpacked the ISO in a shared folder and ran VBoxLinuxAdditions.run from there. After a reboot, I still get the black screen.
In Xorg.0.log I see this error:
Then later:
With 'ps axf', I see this process tree for the X server:
Maybe xhost is hanging there? If I try to strace the process, it seems to be blocked reading something.
I was using gnome-flashback previously, maybe that can lead to problems?
EDIT: I can get to X if I boot the previous kernel, the one from 18.04 (from the grub menu I went to Advanced and selected the second kernel).
I was happily running Ubuntu 18.04 (64 bit) in a VirtualBox VM (Windows 10 being the host), and today I decided to upgrade to 20.04. So after an upgrade check, when Ubuntu told me I could upgrade, I decided to do it, and after the upgrade was done and a reboot, I got the login screen. After logging in, the screen went black. Yay!
I tried to reinstall the VirtualBox guest additions CD. Unfortunately, inserting the drive from VirtualBox doesn't work; shared folders worked, however, so I unpacked the ISO in a shared folder and ran VBoxLinuxAdditions.run from there. After a reboot, I still get the black screen.
In Xorg.0.log I see this error:
Code:
[ 26.488] (EE) Failed to load module "vboxvideo" (module does not exist, 0)Code:
[ 26.656] (EE) modeset(0): glamor initialization failedCode:
1941 ? SLsl 0:00 /usr/sbin/lightdm
1974 tty7 Ssl+ 0:02 \_ /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
2204 ? Sl 0:00 \_ lightdm --session-child 12 19
2274 ? Ss 0:00 \_ /bin/bash /usr/sbin/lightdm-session /usr/lib/gnome-flashback/gnome-flashback-metacity
2383 ? S 0:00 \_ xhost +si:localuser:stefanI was using gnome-flashback previously, maybe that can lead to problems?
EDIT: I can get to X if I boot the previous kernel, the one from 18.04 (from the grub menu I went to Advanced and selected the second kernel).