The problem can be corrected by updating your system to the following package versions: Ubuntu 11.04: puppet-common 2.6.4-2ubuntu2.6 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-1238-2
https://ubuntu.com/security/notices/USN-1238-1
https://bugs.launchpad.net/ubuntu/+source/puppet/+bug/881361
https://launchpad.net/ubuntu/+source/puppet/2.6.4-2ubuntu2.6
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