If you are running Ubuntu jeOS and selected the minimal VMWare installation option you may find that you receive the following error when you attempt to mount a CDROM using the sudo mount /cdrom command from the command line:

mount: unknown filesystem type 'iso9660'

This is because the kernel does not have iso9660 (cdrom filesystem) support built-in. To fix the problem you just need to upgrade your kernel by running the following commands as root from the command line:

aptitude update
aptitude upgrade

then restart your machine by running the following command:

shutdown -r now

Once you’ve restarted you should now find that you can mount CDROM’s by using mount /cdrom command.