Can't Update from Ubuntu 9.10 to Ubuntu 10.04

Hi,

I'm trying to update my Acer Aspire 5536G from Ubuntu 9.10 to Ubuntu 10.04.

The things that happen are shown below.

Checking for a new ubuntu release
Done Upgrade tool signature
Done Upgrade tool
Done downloading
extracting 'lucid.tar.gz'
authenticate 'lucid.tar.gz' against 'lucid.tar.gz.gpg'
tar: Removing leading `/' from member names

Reading cache

Checking package manager
Reading package lists: Done
Reading state information: Done
Reading state information: Done
Reading state information: Done
Done downloading
Reading package lists: Done
Reading state information: Done
Reading state information: Done
Reading state information: Done

Updating repository information
WARNING: Failed to read mirror file

Third party sources disabled

Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.

100% [Working]
bzip2: Compressed file ends unexpectedly;
 perhaps it is corrupted? *Possible* reason follows.
bzip2: Inappropriate ioctl for device
 Input file = (stdin), output file = (stdout)

It is possible that the compressed file(s) have become corrupted.
You can use the -tvv option to test integrity of such files.

You can use the `bzip2recover' program to attempt to recover
data from undamaged sections of corrupted files.

Done downloading
100% [Working]
bzip2: Compressed file ends unexpectedly;
 perhaps it is corrupted? *Possible* reason follows.
bzip2: Inappropriate ioctl for device
 Input file = (stdin), output file = (stdout)

It is possible that the compressed file(s) have become corrupted.
You can use the -tvv option to test integrity of such files.

You can use the `bzip2recover' program to attempt to recover
data from undamaged sections of corrupted files.

Done downloading
100% [Working]
bzip2: Compressed file ends unexpectedly;
 perhaps it is corrupted? *Possible* reason follows.
bzip2: Inappropriate ioctl for device
 Input file = (stdin), output file = (stdout)

It is possible that the compressed file(s) have become corrupted.
You can use the -tvv option to test integrity of such files.

You can use the `bzip2recover' program to attempt to recover
data from undamaged sections of corrupted files.

Done downloading

Error during update

A problem occurred during the update. This is usually some sort of
network problem, please check your network connection and retry.

W:Failed to fetch
http://au.archive.ubuntu.com/ubuntu/dists/lucid/main/source/Sources.bz2
Sub-process /bin/bzip2 returned an error code (2)
, E:Some index files failed to download, they have been ignored, or
old ones used instead.

Restoring original system state

Aborting
Reading package lists: Done
Reading state information: Done
Reading state information: Done
Reading state information: Done

Then nothing happens.

If anyone could help me update

Thanks,
Rowan Quigley