2015.10 update : Update failing (unknown package)

Continuing the discussion from Update failing (unknown package):

As mentioned in the other thread, there are no log entries from an unsuccessful update, so nothing for us to go on. So try to update from ssh and see if you encounter any errors, if so post them here:

sudo apt-get update && sudo apt-get dist-upgrade

Looks like it was updated despite of the error… weird.

Same error with the November update…