Ubuntu Update for software-properties USN-1588-1

Summary
Ubuntu Update for Linux kernel vulnerabilities USN-1588-1
Solution
Please Install the Updated Packages.
Insight
It was discovered that the apt-add-repository tool incorrectly validated PPA GPG keys when importing from a keyserver. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could be exploited to install altered package repository GPG keys.
Affected
software-properties on Ubuntu 12.04 LTS , Ubuntu 11.10 , Ubuntu 11.04 , Ubuntu 10.04 LTS