I also got a similar error message while upgrading my 6.04 server to
8.04. The result of my 'apt-cache policy update-manager-core' is as
below.
------------------------------------------------------------------------
update-manager-core:
Installed: 0.56~dapper5
Candidate: 0.56~dapper5
Version table:
*** 0.56~dapper5 0
500 http://archive.ubuntu.com dapper-updates/main Packages
100 /var/lib/dpkg/status
------------------------------------------------------------------------
Thanks
LK
--
do-release-upgrade fails to upgrade
https://bugs.launchpad.net/bugs/323274
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