Thanks, Benno and William. (And sorry, I'll be careful about duplicate
posts!)

I have Victoria rather than Virginia, so maybe boot issues are different
for me than you. The grub menu doesn't appear at all. Holding "escape"
at boot only brings up a command-line "grub>" prompt. I had to research
hours to figure out how to use it. Typing "normal" at the "grub>" prompt
only sends me to a blank screen with no prompts at all. Typing escape
after that does nothing, so I have to power off/on & start over.

I've tried booting into 157 using "grub>" commands like the following:

grub> set root=(hd0,gpt2)
grub> linux /boot/vmlinuz-5.15.0-157-generic root=/dev/sda2 quiet splash 
nomodeset
grub> initrd /boot/initrd.img-5.15.0-157-generic
grub> boot

But this brings up errors and the "initramfs" prompt I don't understand.

I see on the Linux Mint forum that others are booting into Timeshift
somehow (I do have Timeshift backups), but the instructions online still
assume we have access to the grub menu and not just the command-line
prompt. I'm happy to learn grub> commands, but it's a steep learning
curve. My impression when I got into Linux was that accessing backups
would be easier! =D

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https://bugs.launchpad.net/bugs/2128729

Title:
  Kernel 5.15.0-160 boots without any video output  (on AMD)

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