I have installed SM 4.3.3 on my wife's machine and want to use the Extras CD's for additional packages installation. When I use Synaptic and try to put the CD's into the repositories list by using “edit-add cd rom” it reports “Unable to stat mount point/mnt/cdrom -stat(2 No such file or directory) and that is a true statement. The CD-Rom works and I cane see the contents by mounting it from my desktop. I think a fix would be to edit my apt-sources list but don't know how to construct the 3 lines that would have to be added.
TIA for any help. Maury

Did you try apt-cdrom? That should be all you need to do, except swap out disks as it asks if you any more to add.

Thanks but no joy. The mount point for the cdrom is not where apt-get or synaptic is expecting it to be and so far I haven't found it either..

How is it listed in /etc/fstab?

Problem Solved: added to fstab:
/dev/hdd /mnt/cdrom iso9660,udf noauto,users,exec,ro 0 0
then created cdrom folder in mnt: mnt/cdrom. rebooted and it worked.