I got this error when trying to set up software RAID 0 on 2 different SATA drives.  I set the usual boot, swap partitions, created 2 x ext4’s, created the md0 array and then mounted it as /root.  Did the obligatory format and the install started…. but then errored at installing the base system (I forget the percentag with Insert Media 9.10_Karmic_Koala and the options were Media or OK (iirc).  Neither did anything, I couldn’t eject the DVD to ensure it was clean.

So I rebooted, wiped the DVD (it was clean anyway), and retried – same error.

I then rebooted, ran a media check just in case it didn’t burn correctly (it did pass a verify after burning), and the media check passed.  Just for fun I thought I’d try the install again – and it sailed straight through installing base.  Weird.

I was expecting it to be a bug in the installer and to copy the .iso to a USB drive, ctrl-alt-F2 the install and mount the iso as the cdrom just incase it didn’t get on with my drive (an LG something), but didn’t have to.

Bug on 9.04 here, may or may not be related: http://ubuntuforums.org/showthread.php?p=8347533