Please Install the Updated Packages.

It was discovered that ubuntu-release-upgrader would fail when a user requested an upgrade to Ubuntu 13.04. This would prevent a user from migrating easily to Ubuntu 13.04 before the Ubuntu 12.10 support period ended.

ubuntu-release-upgrader on Ubuntu 12.10

• https://lists.ubuntu.com/archives/ubuntu-security-announce/2013-June/002176.html

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Updated on 2015-03-25