Comment 39 for bug 153980

I've got the same problem...

The GUI frontend tells me:

The system was unable to get the prerequisites for the upgrade. The upgrade will abort now and restore the original system state.
Please report this as a bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bugreport.

And my /var/log/dist-upgrade/main.log reads:

2007-11-02 10:09:06,260 INFO release-upgrader version '0.81' started
2007-11-02 10:09:06,799 DEBUG lsb-release: 'feisty'
2007-11-02 10:09:06,800 DEBUG _pythonSymlinkCheck run
2007-11-02 10:09:07,644 DEBUG checkViewDepends()
2007-11-02 10:09:07,645 DEBUG getRequiredBackports()
2007-11-02 10:09:10,848 DEBUG marking 'release-upgrader-apt' for install
2007-11-02 10:09:10,942 DEBUG marking 'release-upgrader-dpkg' for install
2007-11-02 10:09:11,111 DEBUG pre-requists item: '<pkgAcquire::ItemIterator object: Status: 3 Complete: 0 Local: 0 IsTrusted: 1 FileSize: 1924684 DestFile:'/
tmp/tmpMfFIkn/backports/partial/release-upgrader-dpkg_1.14.5ubuntu11.2_i386.udeb' DescURI: 'http://de.archive.ubuntu.com/ubuntu/pool/main/r/release-upgrader-
dpkg/release-upgrader-dpkg_1.14.5ub'
2007-11-02 10:09:11,111 DEBUG pre-requists item: '<pkgAcquire::ItemIterator object: Status: 3 Complete: 0 Local: 0 IsTrusted: 1 FileSize: 1307096 DestFile:'/
tmp/tmpMfFIkn/backports/partial/release-upgrader-apt_0.6.46.4ubuntu10.3_i386.udeb' DescURI: 'http://de.archive.ubuntu.com/ubuntu/pool/main/r/release-upgrader
-apt/release-upgrader-apt_0.6.46.4u'
2007-11-02 10:09:11,112 ERROR no backports found but setupRequiredBackports() called??!

I've removed all 3rd party repositories from my sources.list and set Synaptic to use the main server, but the problem remains.