Comment 2 for bug 150528

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kling0n (ubuntu-skadaha) wrote : Re: Gutsy upgrade path from feisty fails (update-manager)

it seems to be related to having feisty-backports enabled in /etc/apt/sources.list

changing contents of /etc/apt/sources.list to

--
deb http://security.ubuntu.com/ubuntu gutsy-security main restricted
deb-src http://security.ubuntu.com/ubuntu gutsy-security main restricted
deb http://security.ubuntu.com/ubuntu gutsy-security universe
deb-src http://security.ubuntu.com/ubuntu gutsy-security universe
deb http://security.ubuntu.com/ubuntu gutsy-security multiverse
deb-src http://security.ubuntu.com/ubuntu gutsy-security multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy main
 --

and re-running update-manager seems to fix the issue