gobby binary package in Ubuntu Focal amd64

 Gobby is an editor which allows one to edit text documents and source files
 collaboratively over a network. All users could work on the file
 simultaneously without the need to lock it. The parts the various users
 write are highlighted in different colours and it supports syntax
 highlighting of various programming and markup languages.
 .
 Gobby is portable to both Windows and Unix-like platforms and makes use of
 the Gtk+ toolkit. A dedicated server is available in the infinoted package.

Source package