by Opennet

aaa: After the update, including the default browser settings are removed, and instead of the previously selected Firefox begins to run Microsoft Edge. 

bbb: Just yesterday upgraded from Win 8.1 Pro to Win 10 Pro.  During the update process, I was asked whether I wanted to change any of the defaults. I removed the box, and FF as was a quiet browser before the update, so it remained. I see no problem.

ccc: I tried to upgrade from ubunu 8 to windows 10, failed. The Cheddar?