Ubuntu 11.04 pam_userdb.so missing

ftppamUbuntu

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.

Best Answer

packages.u.c tells us that pam_userdb.so exists in libpam-modules in architecture dependent paths. As a quick workaround, you can install a compatibility symlink:

ln -s /lib/*-linux-gnu/security/pam_userdb.so /lib/security/pam_userdb.so

To solve the problem for real, you need to determine why vsftpd/pam uses the wrong path to lookup the modules. Check for non-upgraded packages or hung processes first. Since all modules in libpam-modules are located in the arch-specific directory I would point to vsftpd in the first place, since other parts of your system seem to work fine with the new location.

P.S.: Don't forget to remove the symlink if you don't need it anymore.

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