Ubuntu comes with gedit, diff (command line) and Nautilus. We have had feedback from many users that GEANY, MELD, and THUNAR are preferred.
Who knows, maybe you will finally find a replacement for VI? No, you are right, that is just being silly! EMACS is king! Wait, Geany was being recommended!
Open a terminal
$ sudo apt install --yes geany meld thunar
$ meld& geany & thunar&
Once the programs open, right click and add to the favorites menu