It seems I have found another issue which is related to this one: I have 1 SATA and one PATA connected to the onboard controller. Next to that I have a seperate SCSI controller with two additional disks. When booting, Dmesg says the following: [42949383.030000] SCSI device sda: 17773500 512-byte hdwr sectors (9100 MB) [42949383.100000] SCSI device sda: drive cache: write back [42949383.100000] sda: sda1 [42949383.100000] sd 0:0:1:0: Attached scsi disk sda [42949383.160000] SCSI device sdb: 17773500 512-byte hdwr sectors (9100 MB) [42949383.230000] SCSI device sdb: drive cache: write back [42949383.270000] SCSI device sdb: 17773500 512-byte hdwr sectors (9100 MB) [42949383.330000] SCSI device sdb: drive cache: write back [42949383.330000] sdb: sdb1 sdb2 sdb4 [42949383.340000] sd 0:0:2:0: Attached scsi disk sdb These are the disks that are connected to my SCSI controller. [42949385.230000] ata2: PATA max UDMA/133 cmd 0x9800 ctl 0x9402 bmdma 0x9008 irq 177 [42949385.430000] ata1: dev 0 cfg 00:0040 49:2f00 82:7c6b 83:7f69 84:4773 85:7c69 86:3e01 87:4763 88:207f 93:0000 [42949385.430000] ata1: dev 0 ATA-7, max UDMA/133, 490234752 sectors: LBA48 [42949385.430000] sata_get_dev_handle: SATA dev addr=0x1f0002, handle=0xdffe5520 [42949385.430000] ata1: dev 0 configured for UDMA/133 This would be my PATA disk [42949385.430000] sata_get_dev_handle: SATA dev addr=0x1f0002, handle=0xdffe5520 [42949385.430000] scsi1 : ata_piix [42949386.610000] scsi2 : ata_piix [42949386.610000] Vendor: ATA Model: Maxtor 6V250F0 Rev: VA11 [42949386.610000] Type: Direct-Access ANSI SCSI revision: 05 [42949386.610000] SCSI device sdc: 490234752 512-byte hdwr sectors (251000 MB) [42949386.610000] SCSI device sdc: drive cache: write back [42949386.610000] SCSI device sdc: 490234752 512-byte hdwr sectors (251000 MB) [42949386.610000] SCSI device sdc: drive cache: write back [42949386.610000] sdc: sdc1 sdc2 < sdc5 > [42949386.650000] sd 1:0:0:0: Attached scsi disk sdc And this is my SATA disk Now, when i booted the first time it would just not boot, and I had to change the boot parameters just like you guys. But now, after i booted there is something strange: according to the mount command root is mounted to /dev/sda1 but ubuntu was installed at my SATA disk ( /dev/sdc1)! So mount mistakes /dev/sdc with /dev/sda. /dev/sdc1 fdisk shows: Disk /dev/sdc: 251.0 GB, 251000193024 bytes 255 heads, 63 sectors/track, 30515 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdc1 * 1 30141 242107551 83 Linux /dev/sdc2 30142 30515 3004155 5 Extended /dev/sdc5 30142 30515 3004123+ 82 Linux swap / Solaris and /dev/sda Disk /dev/sda: 9100 MB, 9100032000 bytes 255 heads, 63 sectors/track, 1106 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 1 5 40131 12 Compaq diagnostics mounts according to the MOUNT command: /dev/sda1 on / type ext3 (rw,errors=remount-ro) proc on /proc type proc (rw) /sys on /sys type sysfs (rw) varrun on /var/run type tmpfs (rw) varlock on /var/lock type tmpfs (rw) procbususb on /proc/bus/usb type usbfs (rw) udev on /dev type tmpfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) devshm on /dev/shm type tmpfs (rw) Trying to mount /dev/sda1 results in the strange situation that /dev/sda1 is mounted but with different fat-systems: /dev/sda1 on / type ext3 (rw,errors=remount-ro) /dev/sda1 on /mnt/sda type vfat (rw) proc on /proc type proc (rw) /sys on /sys type sysfs (rw) varrun on /var/run type tmpfs (rw) varlock on /var/lock type tmpfs (rw) procbususb on /proc/bus/usb type usbfs (rw) udev on /dev type tmpfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) devshm on /dev/shm type tmpfs (rw) Perhaps I am mistaking, but this seems to me like a bug ( and because I had to change the boot paramaters in GRUB to, i think it is correlated with this bug ).