Installed Zentyal 2.0.3 successfully in Virtualbox. I selected the 'Install Guest Additions' under Virtualbox Devices menu with Zentyal running as a VM, which should mount the Guest Additions .iso. However, there is no cdrom directory in /media (of the running Zentyal). When I installed Guest Additions for a Ubuntu VM, there was no problem i.e. it showed the Guest Additions .iso under /media/cdrom and I was able to run the Guest Additions .run (in the .iso) to compile & install the appropriate kernel module (after installing dkms, gcc & linux-headers-($uname -r)). Any ideas why there is no /media/cdrom directory or where the .iso is mounted to?