Public bug reported:

Binary package hint: update-manager

First I had tried to upgrade to 8.04LTS, but this failed and reported possible 
problem with 
Could not calculate the upgrade

A unresolvable problem occurred while calculating the upgrade.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug against the
'update-manager' package and include the files in /var/log/dist-upgrade/
in the bugreport.

I then tried to simply upgrade 7, but got a message headed:
Not all updates can be installed
so I tried partial upgrade, but that got a message:
Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

Please report this bug against the 'update-manager' package and include the 
files in /var/log/dist-upgrade/ in the bug report.
which aborts upgrade...

files from  /var/log/dist-upgrade/ attached

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Attempted upgrade to 8.04 fails, then all upgrades fail
https://bugs.launchpad.net/bugs/230591
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