Updating Debian parallels tools for Parallels 7

On clicking Virtual machine/Install parallels tools seems to do nothing. What should happen is the parallels tools installer .iso image should appear mounted in the virtual cd rom drive (/media/cdrom0)

This may be due to the 'real' host cdrom drive hiding the mounted iso. To remap umount and remount the drive to make the installer appear:

# Check the paths are as described:
cat /etc/fstab

# Unmount current
umount /media/cdrom0
umount /dev/scd0

# Remount
mount -t iso9660 /dev/scd0 /media/cdrom

# Check it's there
cd /media/cdrom0
ls

# Run installer
./install

# UPDATE FOR UBUNTU SERVER 12.04

#mount -t iso9660 /dev/sr0 /media/cdrom