Can't install Thunderbird on Feisty x86-32

[Liam Proven]

Doesn't matter whether I use apt-get or Synaptic, it complains that
there's a corrupt package.

I'm trying to install Thunderbird 2.0 but I need 1.5 from the repos
first to fulfil some dependencies and so on.

I'm using the main UK archives:

http://gb.archive.ubuntu.com/ubuntu/

Any ideas, anyone? Could the file in the repository be corrupt? I've
tried rummaging around using a web browser in the repo itself but I
can't find where the packages themselves live, only the various
summary and index files.

This is the actual error text:

# apt-get install mozilla-thunderbird
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  mozilla-thunderbird-typeaheadfind mozilla-thunderbird-inspector
  mozilla-thunderbird-enigmail
The following NEW packages will be installed
  mozilla-thunderbird
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/10.9MB of archives.
After unpacking 30.4MB of additional disk space will be used.
Preconfiguring packages ...
(Reading database ... 123184 files and directories currently installed.)
Unpacking mozilla-thunderbird (from
.../mozilla-thunderbird_1.5.0.10-0ubuntu3_i386.deb) ...
dpkg: error processing
/var/cache/apt/archives/mozilla-thunderbird_1.5.0.10-0ubuntu3_i386.deb
(--unpack):
 corrupted filesystem tarfile - corrupted package archive
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/mozilla-thunderbird_1.5.0.10-0ubuntu3_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

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