Ubuntu 12.04 will not upgrade & entire disk shows as unallocated.

I have a laptop with Ubuntu 12.04 and Windows 7 dual boot. Both OS's work fine and all boots properly. I want to upgrade, it says that 12.10 is available, but I keep getting the error: "failed to fetch. fetching the upgrade failed. Network Error." I am coected to the inteet, so am not sure why this is happening.

I was looking over my system for any other errors that might be related. What I found, I am not sure if this is relevant, but it seems like a real problem. In gParted, it shows that the entire disk is unallocated. So I put in a live CD and opened gParted to see if this gives me the same result, and yes, it is identical. Looking online for a solution, I found similar issues and have tried several things, but nothing helps. I was able to go to terminal, and get this result of my disk:

ubuntu@ubuntu-laptop:~$ sudo fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 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: 0xda22e49b

Device Boot Start End Blocks Id System
/dev/sda1 2048 25167871 12582912 7 HPFS/NTFS/exFAT
/dev/sda2 * 25167872 25372671 102400 7 HPFS/NTFS/exFAT
/dev/sda3 25372672 568508408 271567868+ 7 HPFS/NTFS/exFAT
/dev/sda4 568508472 625153409 28322469 f W95 Ext'd (LBA)
/dev/sda5 568510464 615407607 23448572 83 Linux
/dev/sda6 615409664 625141743 4866040 82 Linux swap / Solaris
ubuntu@ubuntu-laptop:~$

I don't know much about this. So, not sure what to do here, maybe these are two completely different problems? I want to upgrade to Ubuntu 16.04 LTS. So I was hoping to fix this disk problem, then download the upgrade from the 16.04 ISO, rather than version by version through the update manager. I am assuming this method will not delete my Ubuntu programs and files and would be much faster. Any help would be greatly appreciated.