I can't boot ubuntu. It hangs at a black screen with a mouse pointer that doesn't respond to mouse movement. I've read a number of other threads on this but nothing's worked so far. In particular, I have very limited terminal access: with Ctrl + Alt + F<anything> or Alt + F<anything> I can login and type commands, but I often can't see what I'm typing and after a short time it stops working.
I can get to a grub prompt if I choose a different boot option (not the one which shows you a list of options to boot into, but the one with a prompt).
Other details:
- The mouse pointer is large and low resolution, as though the graphics drivers aren't loading
- I have been using this Ubuntu install without problems for weeks
- I'm dual booting Windows. That runs fine
- I have a GTX 1070 with drivers installed
- I think I installed docker the last time I used Ubuntu
- I have a 20.04 usb pen, which runs fine, and which I've used to copy most of my important files onto an external drive (though not all because files have varying permissions)
UPDATE got to normal grub screen, previous kernel version works (mostly) OK