I seem to have the same problem.  I ran System/Administration/Update
Manager and it offered an upgrade to '10.10'.  I clicked the button to
upgrade, and typed my password when asked.  The "Distribution Upgrade"
window got as far as "Setting new software channels" and said it would
disable some non-standard ones (presumably the NetworkManager PPA
documented at <https://wiki.ubuntu.com/DebuggingModemmanager>).  Then I
got a dialogue box saying:

"Invalid package information

"After your package information was updated the essential package 
'ubuntu-minimal' can not be found anymore.
This indicates a serious error, please report this bug against the 
'update-manager' package and include the files in /var/log/dist-upgrade/ in the 
bug report."

I've attached a tarball of my /var/log/dist-upgrade, since there's a
directory structure there that makes attaching individual files awkward.

** Attachment added: "tarfile of /var/log/dist-upgrade"
   
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/657812/+attachment/1686172/+files/dist-upgrade.tar

-- 
upgrate to 10.10 causes error ubuntu-minimal missing
https://bugs.launchpad.net/bugs/657812
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