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I was running Ubuntu 18.04 on my Dell XPS. I've just upgraded 20.04.

When it boots and gets to the new log in screen, my arrow cursor is frozen and the trackpad does nothing and so the only thing I can do is reboot.

I managed to fix this by going into the boot menu and enabling secure boot. I'm not sure why this would work, but the cursor now moves.

I am now able to type my password and log in to the system, however: when I do so, the cursor is again stuck on the bottom right of the desktop and won't move UNLESS I choose to log in to Ubuntu Wayland and then everything seems okay.

Can someone explain what is happening?

I believe that I have had this problem before when I first got my machine and I was told various things, but it always seemed to involve some combination of (i) turning off / on secure book and (ii) removing / adding nvidia driver.

I found this thread which clearly had the same problem, but there isn't a clear solution in the answers and I don't want to start experimenting and making the problem worse.

user1551817
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    First, I would reboot to secure mode, add network, update system, use tasksel, remove all Desktops and add desired ones again. Then, if problem still exists, I would read log files like dmesg or syslog to find out whats going on – qba-dev Dec 17 '21 at 19:20
  • Try this solution from you quoted AU thread first. If it doesn't work, try a newer NVIDIA driver. The ones from 20.04 are quite dated now. – emk2203 Dec 22 '21 at 10:42
  • I have tried to follow the answers in that solution. I have updated my nvidia drivers to nvidia-driver-470. Didn't fix the issue. I also tried the solution regarding nvidia_drm.modeset=1. I tried both methods. Still no joy. – user1551817 Dec 24 '21 at 21:38
  • @qba-dev I'm not sure what you mean by "add network" sorry. – user1551817 Dec 24 '21 at 21:39
  • @user1551817 after getting to secure boot you need to activate networking to be able to update system or use Tasksel – qba-dev Dec 26 '21 at 11:23
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    @qba-dev "secure-boot" is not the correct term. Grub Recovery Mode is the correct term to use in this case. Here is what secure boot means. Here is what recovery mode means. – Error404 Jan 03 '22 at 15:21
  • @someone thanks for clarification. So, we can say it is a Recovery Mode – qba-dev Jan 04 '22 at 06:53
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    @user1551817 networking is turned off by default in Recovery (99% sure). Check this – qba-dev Jan 06 '22 at 16:26
  • @qba-dev okay, but I'm in Wayland (which I'm using now). So that has wifi etc. Or do I really have to go into recovery mode? – user1551817 Jan 06 '22 at 17:51
  • @user1551817 no, I don't think you need Recovery, but in my opinion it is best way to install/uninstall Desktops, using tasksel – qba-dev Jan 07 '22 at 17:21
  • Can you [edit] to include the output of apt list --installed | grep gdm3 followed by cat /etc/gdm3/custom.conf – Error404 Jan 14 '22 at 09:14
  • Before you login with X11, login on a tty (for eg Ctrl+Shift+F3) and run something like journalctl -xef -p warning to analyze what's going on while login in to X.. Copy the relevant output to your post. – Pablo Bianchi Jan 16 '22 at 22:39

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