I try to set tor web browser as default application in Ubuntu 18.04. After that I have installed it via ppa...
sudo add-apt-repository ppa:micahflee/ppa
sudo apt install torbrowser-launcher
I've tried the followings
sudo update-alternatives --config gnome-www-browser
sudo update-alternatives --install /usr/bin/gnome-www-browser gnome-www-browser /home/fabrizio/.local/share/torbrowser/tbb/x86_64/tor-browser_it/Browser/start-tor-browser 200
this last sudo two times to put it in automatic mode too. But all of this has not been sufficient. Do you have any idea, please?
Note: It seems really difficult to let appear Tor web browser in Activities -> Settings -> Default Applications -> Web
... it seems that appears only Firefox.