Corrupted package files in ubuntustudio

This needs more info. Please try to get ubuntustudio-audio through the terminal and paste the output.

OK, give me a mo and I will give it a go.
In the meantime, this is what Synaptic reported:
E: /var/cache/apt/archives/linux-image-2.6.20-16-lowlatency_2.6.20-16.28_i386.deb: corrupted filesystem tarfile - corrupted package archive
E: /var/cache/apt/archives/libsynfig0_0.61.05-8_i386.deb: corrupted filesystem tarfile - corrupted package archive

This any more helpful?
(Still says packages' tar files are corrupted)

Correcting dependencies...Done
The following extra packages will be installed:
  libsynfig0 linux-image-2.6.20-16-lowlatency
Suggested packages:
  linux-doc-2.6.20 linux-source-2.6.20
The following NEW packages will be installed
  libsynfig0 linux-image-2.6.20-16-lowlatency
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
7 not fully installed or removed.
Need to get 0B/24.9MB of archives.
After unpacking 74.4MB of additional disk space will be used.
Do you want to continue [Y/n]? y
Preconfiguring packages ...
(Reading database ... 140361 files and directories currently installed.)
Unpacking linux-image-2.6.20-16-lowlatency (from .../linux-image-2.6.20-16-lowlatency_2.6.20-16.28_i386.deb) ...
Done.
dpkg: error processing /var/cache/apt/archives/linux-image-2.6.20-16-lowlatency_2.6.20-16.28_i386.deb (--unpack):
 corrupted filesystem tarfile - corrupted package archive
Running postrm hook script /sbin/update-grub.
You shouldn't call /sbin/update-grub. Please call /usr/sbin/update-grub instead!

dpkg-deb: subprocess paste killed by signal (Broken pipe)
Searching for GRUB installation directory ... found: /boot/grub
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-2.6.20-16-generic
Found kernel: /boot/vmlinuz-2.6.20-15-generic
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done

Unpacking libsynfig0 (from .../libsynfig0_0.61.05-8_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libsynfig0_0.61.05-8_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/linux-image-2.6.20-16-lowlatency_2.6.20-16.28_i386.deb
 /var/cache/apt/archives/libsynfig0_0.61.05-8_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

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