This is probably something introduced in libmysqlclient.so.20 that is incompatible with older versions of itself (or MariaDB). You could try a newer MariaDB version. Anyway, the libmariadb of mariadb-10.0 in an old Ubuntu release will not be updated at this point in time.
** Changed in: mariadb-10.0 (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1660503 Title: Malformed packet with mariadb-server-10.0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/exim4/+bug/1660503/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs