I have installed Ubuntu and today i have mount the CDROM successfully. Here is the tips:

Step 1: Open a terminal window and use this command:

sudo gedit /etc/fstab

well this will open the fstab file which contains the informations of your HDD, FDD, CDROM etc.

Step 2: Now goto this line:

/dev/hdb /media/cdrom0 udf,iso9660 user,noauto 0 0

and add just utf8 at the end of noauto with a coma (,). Here is the final line:

/dev/hdb /media/cdrom0 udf,iso9660 user,noauto,utf8 0 0

Step 3: Save the file and exit from fstab file. Insert a cd into your CDROM.

Enjoy with your CDROM…