Hello!
I can't precise what is going wrong... but you can do something, to try to solve this problem...
Ok... when you get that error, just open a new console: <ctrl><alt><f2>, and type "mount /dev/cdrom /cdrom"... maybe you need to change the directories, depending in your system... but if you manage to mount cdrom, it will work, almost for sure!!
Try it...
See you
/edu
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