This is very strange, but I can run the Ububtu Server 12.04 64bit from the live CD to permanently install it on the HD, but when I reboot it reverts back to whatever OS was on the HD prior to the installation. The partitioning does not change, noe are there any traces of Ubuntu on the HD.
The install runs fine, prompts for a reboot, I remove the Live CD and let it reboot and it reboots into the original OS. I've tried installing and deleting and modifying partitions and said yes to making the changes permanent.
The computer is a Dell 1950 with a SAS 6 RAID controller. I've successfully installed both windows 2003 server and Fedora on it. But when I install Ubuntu after installing these, whatever OS was installed just prior to the install is what remains on the HD.
I'm not doing a dual boot. I've run the Ubuntu Boot Repair utility but that doesn't help- there is simply no trace of the ubuntu installation.
Ther is only one HD (actually 2 but in a RAID and appear as one) nor flash drive, nor any other place it could have installed other that the primary HD that the computer boots from.
Thanks for any help!!