In Ubuntu 10.04 all I had to do was turn on my external hard drive and it would automatically be detected and mounted. I just switched over to Ultimate Edition, which I think is Ubuntu 10.04 with a lot of stuff added on to it. The funny thing is when I turn on the external hard drive it doesn't get mounted, and I don't think it's even being detected. I looked in gparted and it doesn't show up there. If I boot into Ubuntu 10.04 and turn on the hard drive it still gets detected and mounted, so there's nothing wrong with it. Ultimate Edition can detect other things connected to USB, like my iPod, so I'm wondering why it can't detect my hard drive.
Edit: When I do tail -f /var/log/messages and if the drive gets detected, this is what it says:
[ 230.520892] usb 1-2.4: new high speed USB device using ehci_hcd and address 6 [ 230.639400] usb 1-2.4: configuration #1 chosen from 1 choice [ 230.639717] scsi9 : SCSI emulation for USB Mass Storage devices [ 235.631550] scsi 9:0:0:0: Direct-Access Maxtor OneTouch 0122 PQ: 0 ANSI: 4 [ 235.632631] sd 9:0:0:0: Attached scsi generic sg3 type 0 [ 235.633120] sd 9:0:0:0: [sdc] 1465149168 512-byte logical blocks: (750 GB/698 GiB) [ 235.634625] sd 9:0:0:0: [sdc] Write Protect is off [ 235.636443] sdc: sdc1 [ 235.651885] sd 9:0:0:0: [sdc] Attached SCSI disk
When the drive is not detected then it doesn't say anything.