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

-- 
Gutsy upgrade path from feisty fails (update-manager)
https://bugs.launchpad.net/bugs/150528
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