[ubuntu] confused chrooter in waiting looking to grub install from liveDVD

I'm eventually looking to repair my grub using a liveDVD. I'm really confused with my partitions when it comes to attempting to chroot the system first.

when i

Quote:

sudo fdisk -l

I get the following:

Code:

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000537dc Device Boot Start End Blocks Id System /dev/sda1 * 63 98060759 49030348+ 82 Linux swap / Solaris /dev/sda2 98060760 1953520064 927729652+ 5 Extended /dev/sda5 98060823 1953520064 927729621 83 Linux Disk /dev/mapper/nvidia_cbddiijb: 1000.2 GB, 1000204884992 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525166 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000537dc Device Boot Start End Blocks Id System /dev/mapper/nvidia_cbddiijb1 * 63 98060759 49030348+ 82 Linux swap / Solaris /dev/mapper/nvidia_cbddiijb2 98060760 1953520064 927729652+ 5 Extended /dev/mapper/nvidia_cbddiijb5 98060823 1953520064 927729621 83 Linux Disk /dev/mapper/nvidia_cbddiijb2: 950.0 GB, 949995164160 bytes 255 heads, 63 sectors/track, 115497 cylinders, total 1855459305 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mapper/nvidia_cbddiijb2p1 63 1855459304 927729621 83 Linux Disk /dev/mapper/nvidia_cbddiijb5: 950.0 GB, 949995131904 bytes 255 heads, 63 sectors/track, 115496 cylinders, total 1855459242 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/nvidia_cbddiijb5 doesn't contain a valid partition table Disk /dev/mapper/nvidia_cbddiijb1: 50.2 GB, 50207076864 bytes 255 heads, 63 sectors/track, 6103 cylinders, total 98060697 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/nvidia_cbddiijb1 doesn't contain a valid partition table

I took this to mean that i could try either:

Code:

mount /dev/sda5 /mnt/

or

Code:

mount /dev/mapper/nvidia_cbddiijb5

but whenever i try either i get

Code:

mount: special device /dev/nvidia_cbddiijb5 does not exist

Could someone please try and explain what is going on here and what i'm doing wrong