Comment 6 for bug 961735

I narrowed the cause down to one of the things I did or didn't do listed below:

1) I made the bootable USB liveCD using unetbootin. Unetbootin doesn't clean the USB disk (as ubuntu usb-creator does) and I had not removed the files on the USB disk. Unetbootin does ask if I want to overwrite existing files, but some old files might remain.

2) I had not cleaned (formatted) the root partition I installed to in advance of the installation, but formatted the root partition during the installation.

3) I use a separate /home partition (which I left intact) and the home directory of the user I made during the installation already existed with some files in it.

If I clean the USB disk, root partition and user directory in advance of installing I can complete the installation without problems (after working around bug #966294).

While 1) is obviously my own stupidity, 2) and 3) might be reported as bugs here already. I'll trawl launchpad to see what I can find. If I don't report back, consider this report a fluke.