I am redoing a couple of PCs this weekend. I removed the old partitions with GPARTED, and started fresh installations with ISO images I have downloaded from the Ubuntu site and burned with three different PCs, several different ISO image burning programs, and several different batches of CD-ROM and DVD media. Installation errors out just after you set username and password. Others have reported problem on Ubuntu forum, but does not seem to be answers there.
Is there an expert who can help?