iso9660 not loaded by default. cannot load once system started.

[Dexter Ang]

iso9660 (aka isofs.ko) is not loaded by default. This results in me being unable
to mount a standard (burned) CD. mount /dev/cdrom results in the error:

mount: unknown filesystem type 'iso9660'

modprobing iso9660 results in this:

FATAL: Error inserting isofs
(/lib/modules/2.6.10-4-386/kernel/fs/isofs/isofs.ko): Invalid module format

Have not tried loading iso9660 on boot via /etc/modules, but according to post
in ubuntuforums.org it work. Post URL is at:

http://ubuntuforums.org/showthread.php?t=19453&highlight=iso9660

[Dexter Ang (thepoch-1234-deactivatedaccount-deactivatedaccount)]

Confirmed loading module iso9660 via /etc/module makes mounting CDs correctly.

[Matt Zimmerman (mdz)]

If you rebooted before upgrading your kernel, you will need to reboot again once
you upgrade to 2.6.10-27, or you will see the same problem

This bug has been marked as a duplicate of bug 13830.

[Aswarp (aswarp2002)]

Sorry, but bug13830 does not seem like a duplicate for this one. It goes about Nvidia drivers not loading.

I got the same effect. Some days ago I had some trouble with the cdrom not automounting on Kubuntu 8.10 and had to mount and unmount it manually. Susprisingly, I had to use "su" to unmount from a different user account than the one I mounted it from, or it won't let me.
A couple days later I removed some old kernels from my system to save space with the usual fools-proof procedure. After that and wothout having rebooted, I tried to read a cdrom and it would not mount. The CD is detected when put into the drive, but it does not mount automatically, so I tried to do this manually with mount -t iso9660... and it would not either.

See my console session:
internet@aswkubuntu:/$ sudo mount -t iso9660 /dev/cdrom /media/cdrom0/ -o force
[sudo] password for internet:
mount: unknown filesystem type 'iso9660'
internet@aswkubuntu:/$ sudo mount -t udf /dev/cdrom /media/cdrom0/ -o force
mount: unknown filesystem type 'udf'
internet@aswkubuntu:/$ sudo mount /dev/cdrom /media/cdrom0/
mount: unknown filesystem type 'iso9660'
internet@aswkubuntu:/$ sudo umount /dev/cdrom
umount: /dev/cdrom: not mounted
internet@aswkubuntu:/$ sudo mount /dev/cdrom /media/cdrom0/
mount: unknown filesystem type 'iso9660'
internet@aswkubuntu:/$ sudo mount -t iso9660 /dev/cdrom -r /media/cdrom0/
mount: unknown filesystem type 'iso9660'
internet@aswkubuntu:/$ sudo mount /dev/cdrom -t iso9660 -r /media/cdrom0/
mount: unknown filesystem type 'iso9660'
internet@aswkubuntu:/$ sudo modprobe iso9660
FATAL: Could not load /lib/modules/2.6.24-19-generic/modules.dep: No such file or directory
internet@aswkubuntu:/$ sudo aptitude update

I feel quite confident that the problem will go away if I reboot this server, but hopefully there is another way to do it. Or there isn't?