Install unrar by entering the following commands in the terminal:
sudo apt update sudo apt install unrar
Description:
Unarchiver for .rar files (non-free version)
Unrar can extract files from .rar archives. If you want to create .rar archives, install package rar.
Homepage: http://www.rarlabs.com/
Version: 1:5.5.8-1
Section: multiverse/utils