I have an Ubuntu 20.04 system that I have been using with no problem for well over a year. I dual boot this computer between Linux and Windows. In case this information is useful the video card is an nVidia GTX-1070.
Today I rebooted from Linux into Windows and then back into Linux about an hour later. When my machine started it took longer than normal but eventually did bring me into a login window, however I'm stuck at 640x480. If I log in there are no other resolutions available. Also, when I shut down or restart the computer, about 8 times out of 10 it hangs and I have to hold the power button in.
If I boot into Windows everything works perfectly so it does not seem like a hardware problem.
I would really appreciate any pointers anyone could provide because I'm a bit desperate to get this working again, I spend most of my time in Linux and use it for work and really don't have time to do a clean reinstall right now.
Thanks in advance.