Well I wasn't aware that the LiveCD installer was unstable, the Ubuntu website said that 6.06 was stable enough for everybody to start using.
After reading Robbbert's reply I reinstalled Ubuntu 5.10 and performed the upgrade to Dapper as he suggested (also the way Ubuntu recommend you to upgrade). After 4 hours of downloading/installing this also failed!!! and completely wrecked the 5.10 system.
I can't say I'm very impressed with Ubuntu at the moment, both of the two main install/upgrade options failed and I was following the instructions to the letter. In the case of the upgrade, the 5.10 had only been installed less than an hour and so was completely clean and the upgrade still failed.
After reading a round I found that the text install option has been removed from the standard desktop cd (the new name for the liveCD) and is only available as the 'Alternate install' disc. I'm glad to say that using this went with out a hitch and I am writing this from Ubuntu 6.06. What's more I've got XGL working
Thanks for the help Robbbert
Anyone else out there reading this and thinking of moving to Dapper I thoroughly recommend that you only use the 'alternate install' cd and NOT install through the liveCD and NOT by an online upgrade.