I recently upgraded my monitor to a 34" ultrawide. Everything seemed fine, but the integrated graphics seemed a bit laggy. So, I installed the Nvidia graphics drivers sudo apt install nvidia-3XX and rebooted. (Following this guide)
Problems!! My computer now won't boot. I tried switching the monitor back out to no avail.
Current OS: Ubuntu 19.04
What I've tried so far
I've followed the suggestions here and here and can boot into Grub 2.0. My boot appears to be on sda6
grub> set root=(hd0,msdos6)
grub> linux /boot/vmlinuz-<file> root=/dev/sda6
grub> initrd /boot/initrd.<file>
grub> boot
If I boot normally, I get a broken boot. And if I boot in recovery mode, I see a similar problem as this question but I'm unable to enter command line via CTRL+ALT+F1 as the OP suggests.
Both regular boot and boot from grub show me something like these images: https://photos.app.goo.gl/HLvNJX7eLkdN5EBy9
One thing I'm considering is upgrading to Ubuntu 19.10. I've burned the ISO onto a USB stick, but install isn't offering an upgrade option; just a split partition ("Install Ubuntu 19.10 alongside Ubuntu 19.04"). I don't want to lose my files on 19.04; but I'm perfectly happy upgrading to 19.10. I don't need or want both OS.
Question: How do I upgrade from ISO image? Or how do I recover files from a non-bootable 19.04 so that I can just erase and reinstall? I've also got a Windows VM attached to 19.04 which I don't want to lose files from. Any help appreciated!!
Edit: I decided to just erase the 19.04 install and associated files and re-install with 19.10
