You can always run the following commands to remove the .save and .distUpgrade files temporarily but they seem to be created again rather quickly.
cd /etc/apt/sources.list.d/ sudo rm *.save sudo rm *.distUpgrade
If this bug isn't fixed there might be a lot of confusion when people update for the first time after upgrading from Lucid to Maverick...
You can always run the following commands to remove the .save and .distUpgrade files temporarily but they seem to be created again rather quickly.
cd /etc/apt/ sources. list.d/
sudo rm *.save
sudo rm *.distUpgrade
If this bug isn't fixed there might be a lot of confusion when people update for the first time after upgrading from Lucid to Maverick...