3 days ago I bougth computer parts and put them together. Ubuntu 19.10 would only install in safe graphics mode, but it worked. Then I changed my motherboard and sent the old one back to the seller. The ubuntu continue working. Then I reinstalled ubuntu 19 and now when I boot, I end up in a purple screen where the mouse works, but nothing more. Just purple and mouse. If I use nomodeset I end up in a flickering screen after boot. Flickers from black to almost black.
Ubuntu 18.04.4 will also only install/live boot in safe graphics mode, but after installation, I boot into purple screen with mouse working. I entered the grub menu and added nomodeset to my kernel but when I boot with it I get a flickering screen (from black to almost black) ando nothing more happens.
On more older kernels (4.15.x) I can get up to the login screen, when I put the password I enter a black screen and then HDMI loses signal.
I don't know why it worked on the older motherboard and even worke don the new one. Only after I reinstalled things it stopped working.
If I install with "download proprietary drivers" on, I get it to boot, but into the resolution 1024x768, which I can't change.
But I don't want to use proprietary drivers, I don't want to install aything proprietary in this machine, only in the virtual machines.
UPDATE: I remember what I did! If I plug the GPU in the first slot (and change the motherboard to use video at slot 1) I arrive at the login screen, but if I just log in, I get a black screen. However, if I change, in the small gear icon, to use Wayland instead of Xorg, I can login correctly. Then I can simply put the GPU back into slot 2 and change the motherboard to use video in slot 2. Then everything works!
However, I'd still like to get into the root of these problems, I found that video debugging in linux is very weak and I'd like to understand what is happening, because I really hate installing proprietary drivers.
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