No package unrar available.

This error message means that the package "unrar" is not available in your current package repository. To resolve this issue, you will need to add the repository that contains the "unrar" package or download and install the package manually.

If you are using a Linux distribution that uses the apt package manager, you can try the following command to install the "unrar" package:

sudo apt-get install unrar

If you are using a different package manager or operating system, you may need to consult the documentation or support resources for that system to find out how to install the "unrar" package.