You have a huge amount of this in your syslog, which eventually caused the kernel to give up on writing to the hard disk:
Nov 8 00:02:22 ubuntu kernel: [4295077.239000] sd 0:0:0:0: SCSI error: return code = 0x8000002 Nov 8 00:02:22 ubuntu kernel: [4295077.239000] sda: Current: sense key: Aborted Command Nov 8 00:02:22 ubuntu kernel: [4295077.239000] Additional sense: Scsi parity error Nov 8 00:02:22 ubuntu kernel: [4295077.239000] end_request: I/O error, dev sda, sector 30418183 Nov 8 00:02:22 ubuntu kernel: [4295077.239000] Buffer I/O error on device sda1, logical block 3802265 It may help to check whether the hard disk is old and in need of replacement, to move the system to a cooler environment, or to check for proper SCSI termination. ** Changed in: ubiquity (Ubuntu) Status: Unconfirmed => Rejected -- installation error installins ubuntu v6.06 directly from CD-boot https://launchpad.net/bugs/70851 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs