trying to install 22.04 LTS onto my laptop (ThinkPad P50). I've had a working dual-boot W10+20.04 for a few years.
When I set that up, though, I made a bad decision and only gave 70GB of the drive to Ubuntu (also 30GB for swap, 1GB for boot/grub), so I didn't want to just upgrade, I needed to shrink the windows volume some more and repartition/reinstall. (Good thing is, before I started this I backed up all my files.)
I shrunk the windoze volume down as much as possible, which will give over 400GB available for linux stuff. Using the installer 'do something else' partition utility, I deleted all the old partitions, and started partitioning up the available space, like
/dev/sda5 EFI for boot: 500MB
/dev/sda6 ext4 for /: 400GB-ish
/dev/sda7 swap, 30GB-ish
Install seems to go ok until the end it says grub failed, 'this is a fatal error', and indeed trying to boot up it just says "unknown filesystem; grub rescue>". From there I can ls (it shows some labels, probably one per partition), and I can't guess any other commands (and 'help' is not one of them)
I checked my BIOS and I have secure boot off, UEFI/Legacy is Both, I've been googling, and I don't understand all this BIOS/UEFI/GPT/MBR stuff, I'm sure somebody more fluent in this stuff will be able to give me the missing piece of the puzzle and get me going again.
help?
