I'm getting that error when trying to update to 20.04. I've updated, upgraded, dist-upgraded, showhold [it returns nothing]... like everything is updated and it's still telling me to update before upgrading to 20.04 [I feel like my computer is Mr. Burns saying "I thought I told you to shave off those sideburns!"] Any idea what I'm missing? Ah've updated all I can, she can'ae update noo more!