We just upgraded Ubuntu Server 10.10 to 11.04. After this upgrade, it seems Vsftpd with pam_userdb logins no longer work. I was investigating this and it seems /lib/security/pam_userdb.so is missing.
This is very strange, and even if I do
sudo apt-get install --reinstall libpam-modules it is still missing.
Any idea what is going on? Is this a known bug or is there something wrong on our end?
P.S. Vsftpd with userdb logins was working fine with at least 3 previous versions of Ubuntu, now this 11.04 upgrade seems to have broken it.