With my previous installation I just had
/usr/bin/udisks --mount /dev/sda2 && /usr/bin/udisks --mount /dev/sda3
among the startup applications, but on my new installation (also 12.04.4) it has no effect.
The command works fine in the terminal.
Autostarting firefox using the startup applications tool works also.
How do I automount those partitions?
(No, update does not help!)