4.0 ice cream sandwich - phone mounts as media device not usb storage

My Samsung Galaxy SII used to mount normally as a USB drive in Ubuntu until the 4.0.3 upgrade. Now the only two options are:

• connect as Media Device (MTP)


• connect as Camera (PTP)

neither of the above works properly with Ubuntu 12.04 so I could browse and manage files on the phone and the SD card.

Does Android 4.1 not support the device to be mounted as USB drive anymore?? I tried turning on USB Debugging in developer options but no difference...