First error:
"dpkg: unrecoverable fatal error, aborting: files list file for package 'rpicam-apps' is missing final newline"
This error initially only affected rpicam-apps. When I googled the fix and followed instructions for how to fix the missing final newline error, the issue was not resolved and spread to include libc6:armhf and libmd0:armhf. The instructions I followed to try and fix the rpicam-apps error included moving all the rpicam-apps files to a different location and reconfiguring, updating, and upgrading with sudo apt.
/var/lib/dpkg/info contains no files named rpicam-apps.[any extension], because these were removed in the initial attempt to fix the error. I have these backed up.
/var/lib/dpkg/info contains no files named libc6:armhf.[any extension]. These are nowhere to be found.
/var/lib/dpkg/info contains all files the files it should with the name libmd0:armhf.[any extension], including .list, .md5sums, .shlibs, .symbols, and .triggers.
I am on a Raspberry Pi 5 which uses arm64 instead of armhf, so libc6:arm64 files are present as well. These do not have any errors.