Comment 14 for bug 313452

Revision history for this message
Chaos (a4571597) wrote : Re: Jaunty, Karmic: when booting from one partition and installing to another, installer fails to unmount '/cdrom' this halts installation.

The issue seems to be that you only ever need to write to the partition table if it is changed.

Other people with problems caused by the same bug:
http://ubuntuforums.org/showthread.php?p=9143667#post9143667
http://ubuntuforums.org/showthread.php?p=9210368
http://ubuntuforums.org/showthread.php?p=7769950#post7769950

Workaround: sudo umount -l -r -f /isodevice

This should really be fixed and it is quite easy to do.