GNU/Linux Ubuntu 21.04 Installing RabbitVCS – QuickStart Guide
Hi! Embark on a guided journey with our tutorial, detailing each step to effortlessly Install RabbitVCS on your Ubuntu 21.04 Hirsute GNU/Linux Desktop.
And RabbitVCS for Ubuntu 21.04 is a Set of Graphical Tools written to provide Simple and Straightforward Access to the Version Control Systems you use.
It currently Supports Subversion and Git on a variety of clients such as Nautilus, Thunar, Nemo, Caja, Gedit, and on the Command Line.

1. Launching Terminal
How to QuickStart with Command Line on Ubuntu
First, Update the Apt Repo Sources with:
sudo apt update
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.