Since Kyle mentionned the problem might be related to kernel modules, here is the difference between the lsmod on an installed system and the lsmod on a system after booting from the installation media:
3c3 < af_packet 23816 2 --- > af_packet 23816 6 7c7 < ata_piix 16132 3 --- > ata_piix 16132 1 26c26 < ext3 133128 2 --- > ext3 133128 0 30c30,31 < freq_table 5792 3 acpi_cpufreq,cpufreq_ondemand,cpufreq_stats --- > freq_table 5792 3 acpi_cpufreq,cpufreq_stats,cpufreq_ondemand > fuse 46612 1 38,39c39,41 < ipv6 261920 12 < ipw3945 118688 0 --- > ipv6 261920 10 > ipw3945 118688 1 > isofs 36284 1 44c46,47 < libata 117912 2 ata_generic,ata_piix --- > libata 117912 2 ata_piix,ata_generic > loop 17800 2 48a52 > nls_cp437 6784 1 61c65 < scsi_mod 142348 4 sg,sd_mod,sr_mod,libata --- > scsi_mod 142348 4 sg,sr_mod,sd_mod,libata 63c67 < sd_mod 22272 4 --- > sd_mod 22272 0 84c88,89 < sr_mod 17060 0 --- > squashfs 46340 1 > sr_mod 17060 1 91a97 > unionfs 74148 1 -- Feisty herd 3 desktop CD sometimes fails to boot on CHGL30945PM1 https://launchpad.net/bugs/82921 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs