I'm just trying a watch a commercially bought DVD on my laptop, but Ubuntu 12.04 won't recognise UDF:
$ sudo mount -t udf /dev/cdrom /media/cdrom mount: unknown filesystem type 'udf'
I got the same message (more or less) from a dialog that popped up after putting the disk in. My understanding is that support for UDF should be built in. I know there's lots of questions regarding similar issues around, but the solutions all seem to suppose that Ubuntu knows what UDF is. Ubuntu is up to date, and I've rebooted very recently. Thanks.
$ sudo dpkg --list | grep libdvd ii libdvdnav4 4.2.0-1ubuntu0.1 DVD navigation library ii libdvdread4 4.2.0-1ubuntu4 library for reading DVDs
libdvdcss doesn't seem to be available for download, but maybe that package isn't necessary any more??