Ubuntu 20.04 upgrade causes black screen on reboot

A fresh install of Ubuntu 20.04 focal works. Also mounting and installing the Parallels Tools works on my side. Tested on Parallels
Version 15.1.4 (47270) and OSX 10.14.6. After spending two hours trying to fix my upgraded (from 18.10 over 19.04 to 20.04) Ubuntu, I gave up and downloaded the Ubuntu 20.04 ISO and re-installed it (took me 15mins). Not sure how I would have fixed it but now I have a working, supported and properly installed Ubuntu LTS.
 
RobertoN1 said:
A fresh install of Ubuntu 20.04 focal works. Also mounting and installing the Parallels Tools works on my side. Tested on Parallels
Version 15.1.4 (47270) and OSX 10.14.6. After spending two hours trying to fix my upgraded (from 18.10 over 19.04 to 20.04) Ubuntu, I gave up and downloaded the Ubuntu 20.04 ISO and re-installed it (took me 15mins). Not sure how I would have fixed it but now I have a working, supported and properly installed Ubuntu LTS.
Click to expand...
Same here --- I installed a fresh Ububtu 20.04 and all works fine - even the Parallels Tools installs fine. Running on OS X Catalina and Parallels Pro build 48507.
Mint 19.3 works fine as well - now if they could just bring themselves to support FreeBSD ...
 
I've got the same problem here. The problem is switching to GUI mode / X-Windows greeter. I'm not sure what change there was coming from 18.04 LTS to 20.04 LTS.
Ctrl + Alt + F2 brings up the console and the system is running.
  • Removing guest tools didn't help
  • Installing guest tools didn't help
So I then turn off the splash screen (Plymouth) so I can see what's happening at boot

Code: 
sudo -i
vim /etc/default/grub
  remove 'quiet splash' from GRUB_CMDLINE_LINUX_DEFAULT="".  Leave the quotes
update-grub

Now I can see that the boot gets to "[ OK ] Reached Target Graphical Interface." and doesn't do much after that.
Now on to figure out how to get X-Windows runnning...
 
Running `startx` from the console (Ctrl + Alt + F2) works, and KDE boots. I'm guessing this is all because I was setup to use KDE w/ 18.04 LTS and now it's switched to Gnome as default? Still digging.
 
I fixed this by switching back to gnome, and selecting gdm3 instead of sddm as the Display Manager. I think this was all because I was migrating from Kubuntu (KDE) 18.04 and not normal Ubuntu 18.04 (Gnome).

Code: 
sudo apt install ubuntu-desktop
# Choose gdm3 when the prompt comes up

Fixed!
 
NicholasW6 said:
Anyone know a fix for Ubuntu 20.04? After I upgrade it just has a black screen after booting. By using control + alt + 2 I was able to get a textual login screen, but nothing else.
Click to expand...
I can report that a new install from the iso image of Ubuntu 20.04 with Parallels Version 13.3.2 (43368) goes to a black screen after manually selecting "English" and "install" prompts from the build of iso.
 
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