ubuntu-archive-keyring.gpg': No such file or directory

installed gutsy server
apt-get update/upgrade
do-release-upgrade -d
reboot
apt-get update/upgrade

error:

dependency tree
Reading state information... Done
The following packages will be upgraded:
  ubuntu-keyring
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 10.4kB of archives.
After this operation, 0B of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://cp600 hardy/main ubuntu-keyring 2008.03.03 [10.4kB]
Fetched 10.4kB in 0s (22.6kB/s)
(Reading database ... 26954 files and directories currently installed.)
Preparing to replace ubuntu-keyring 2008.01.16 (using .../ubuntu-keyring_2008.03.03_all.deb) ...
Unpacking replacement ubuntu-keyring ...
Setting up ubuntu-keyring (2008.03.03) ...
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <email address hidden>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <email address hidden>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
cp: cannot create regular file `/var/lib/apt/keyrings/ubuntu-archive-keyring.gpg': No such file or directory
touch: cannot touch `/var/lib/apt/keyrings/ubuntu-archive-keyring.gpg': No such file or directory
dpkg: error processing ubuntu-keyring (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 ubuntu-keyring
E: Sub-process /usr/bin/dpkg returned an error code (1)