Bug#626450: lost /lib64 -> /lib symlink on amd64; upgrade fails
Unpacking replacement libc6 ...
dpkg (subprocess): unable to execute rm command for cleanup (rm): No such file or directory
dpkg: error while cleaning up: subprocess rm cleanup returned error
exit status 2
Could not exec dpkg!
I see lib64 is gone from / and /usr in /var/lib/dpkg/info/libc6.list
... once I added the /lib64 -> /lib symlink back, things more or less