Thanks for your reply.
My bios reports drives a follows:
IDE Channel 0 Master - this is my CD-ROM drive
IDE Channel 0 Slave - This is a 500 GB ATA hard drive used for data only.
IDE Channel 2 Master - ST3320620AS - This is my primary Seagate SATA2 XP boot drive which boots XP fine.
IDE Channel 2 Slave - Samsung HD501LJ - This is my second 500 GB SATA2 drive on which I have installed UBUNTU. It also boots without difficulty.
I installed UBUNTU without the other two drives connected to make sure I didn't hose my XP partition. My Motherboard has a bois boot option which allows me to boot from the XP or the Ubuntu drive on the fly. So far so good.
XP shows the Samsung drive correctly with 1 primary and 3 extended partions. The primary is the Ubuntu \ partition. One of the extended partitions is swap, the other two are NTFS. These drives do have master/slave jumpers and I had to set the second one to slave for XP to see it.
Windows reports all partitions on this second drive as healthy, but lists the first two as "unknown".
Partition Magic give me a "Partition Table error #114" on the Samsung drive and does not see any of its partitons.
I tried the gparted-live-0.3.4-6.iso CD with the same "Unlink after no-IRQ" error at which point installation stops. I have not yet tried earlier versions, nor have I tried changing the hard drive configuration. The Gigabyte motherboard has support for 4 SATA drives and 1 IDE connector.
The error message occurs after USB ports are correctly identified. The error message is cryptic. Does it mean that it is confused by the IRQ settings for the hard drive controller on the motherboard?