Remove Line 648 of /usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeViewGtk3.py:
--- len (pkg.summary)
Remove everything but the last 3 closing parentheses (and one closing square brace) in that line. The problem is that that particular line is an unneeded argument to a function (the function only accepts one argument and there are two passed to it).
Workaround for now:
Remove Line 648 of /usr/lib/ python2. 7/dist- packages/ DistUpgrade/ DistUpgradeView Gtk3.py:
--- len (pkg.summary)
Remove everything but the last 3 closing parentheses (and one closing square brace) in that line. The problem is that that particular line is an unneeded argument to a function (the function only accepts one argument and there are two passed to it).