in Debian Buster is their a way to check integrity of /lib and /lib64 and if corrupted to restore them? Iam looking for a while now, but Iam not so familiar with Linux and could not find anything. If possible I would avoid the time to reinstall linux again.
You can use :
dpkg --verify
It will check that all files belonging to a package have the same hash as recorded from the package's metadata.
Corrupted files appear with a 5 as the third character :
??5?????? /usr/lib/x86_64-linux-gnu/libdrm_radeon.so.1.0.1
This useful to detect accidental corruption, but not malicious modifications (e.g. rootkit)