I got into 157! 🥳 Thank you everyone for your help! It turns out that my
case was weird for two reasons, so here are the steps if anyone has a
similar problem:

(1) The grub menu was completely hidden for me by default, and I never
got it up. (This was also the case for the other 160 error/bug reporter
at #2128904. Maybe it affected those of us with Victoria rather than
Virginia.) I had to work within the "grub>" command line the whole time,
and I found these directions the clearest to follow:
https://www.linuxfoundation.org/blog/blog/classic-sysadmin-how-to-
rescue-a-non-booting-grub-2-on-linux

--- Btw, Benno, thanks for the tip about leaving out "quiet splash
nomodeset." I could see the process working! (Well, up to a point...
lol...)

(2) The "successful" 157 boot always ended with errors and a "BusyBox"
command prompt with "initramfs." I figured out eventually I should type
"Exit" to see more details on the errors. (Here is a great link about
BusyBox/initramfs:  https://ostechnix.com/how-to-fix-busybox-initramfs-
error-on-ubuntu/ .) The initramfs report told me that there was no root
file system! 😱 I was about to try booting from a live usb as William
suggested, but I was afraid of data loss. By chance I happened to check
whether I had got the partition name right for my root file back when I
put it in the "grub>" command. I assumed I should use the "sda"
nomenclature that is standard for Linux. It turns out that within
"BusyBox" you can run commands to see your partitions, so I looked at
them... and they weren't "sda" but "nvme-." So I went back to "grub>"
and tried to boot into kernal 157 again using nvme- as the partition
name, and the boot worked like a charm.

I'm sure these must look like the dumbest newbie things to figure out.
So thanks everyone for your patience. I guess it confirms what the
#2128904 bug report says: "Recovery required understanding of GRUB,
kernel parameters, and initramfs" and "Users without advanced Linux
knowledge would be unable to recover their systems." Somehow I got
lucky. 😅 I hope this helps others too!

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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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