Depois de relatar o mesmo problema aqui no fórum e ter modificado o fstab como proposto
(veja esse tópico:
http://ubuntuforum-pt.org/index.php/topic,66645.msg373194.html#msg373194)
me pareceu que a questão estava resolvida. No entanto fui colocar outro cd no drive há pouco e apareceu o seguinte erro:
Error mounting: mount exited with exit code 1: helper failed with:
mount: mount point /media/cdrom0 does not exist
Alguém pode ajudar???
meu fstab:# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda1 during installation
UUID=d86ab621-4f15-4653-8c9e-470da5ebedb7 / ext4 errors=remount-ro 0 1
# /home was on /dev/sda2 during installation
UUID=e67f1226-a199-4e76-ac55-ce89dbefe19f /home ext4 defaults 0 2
# swap was on /dev/sda3 during installation
UUID=a62a7b4d-c1c4-4d81-8688-3c2a7069aca3 none swap sw 0 0
/dev/sr0 /media/cdrom0 udf,iso9660 rw,user,noauto 0 0