Comment 13 for bug 288675

Nick Glynn (exosyst) wrote :

I hunted out this as I had a similar problem as I was installing without CD-ROM by extracting the ISO to an existing Fedora install and booting from there via grub.

I *simply* performed the following which prompted ubiquity to spring back to the realm of usable:

sudo umount -l -r -f /dev/sda3 (where sda3 was the device mounted as cdrom)