I had the same problem. I just installed libpam-mysql(libpam-mysql_0.7~RC1-4ubuntu1_i386.deb) from the repository 15.10. MariaDB - Vsftpd - Pam worked.
I had the same problem. mysql(libpam- mysql_0. 7~RC1-4ubuntu1_ i386.deb) from the repository 15.10. MariaDB - Vsftpd - Pam worked.
I just installed libpam-