Ubuntu Update for apt USN-1169-1

Summary
Ubuntu Update for Linux kernel vulnerabilities USN-1169-1
Solution
Please Install the Updated Packages.
Insight
William Grant discovered that APT incorrectly validated inline GPG signatures. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could potentially be used to install altered packages.
Affected
apt on Ubuntu 11.04