so I tried to install Ubuntu 22.04.2 in Hyper-V on my Windows Server 2012. Installation goes fine but the first boot stops on black screen and a mouse cursor which doesn't move. I found some guide to change grub config which seems to help a bit
Now it boots into login screen, I login and see the desktop, but it takes about 8 seconds before image freezes and mouse stops moving! Then I can only switch to text console via ctrl+alt+F3 for example, but switching back to F1 shows just black screen and cursor again. Any ideas?