Configure the APT repository

Beginning with Ubuntu 22.04 (Jammy Jellyfish) and Debian 11 (Bullseye), the apt-key utility has been deprecated.For these (and newer) operating systems it is instead recommended to manage keyring files in the /etc/apt/trusted.gpg.d/ directory.

The Advanced Packaging Tool, or APT, is used to handle the retrieval, configuration, and installation of software packages and the removal of software on Debian GNU/Linux distributions.
The R1Soft software repository is signed and a GPG key is provided for verification. The key must be added or trusted before APT will allow installation from it.

Steps for more recent Operating Systems, such as Ubuntu 22.04, Debian 11 and newer.

1) First, download the R1Soft apt gpg key to the /etc/apt/trusted.gpg.d/ directory :

 # wget -qO- http://repo.r1soft.com/r1soft.asc | tee /etc/apt/trusted.gpg.d/r1soft.asc 

2) After the key is saved successfully, the next step is to create a sources file for the R1Soft repo:
Use your favorite text editor to create the r1soft.sources file, here :

 /etc/apt/sources.list.d/r1soft.sources 

Copy the lines below inside the r1soft.sources file.

 
Types: deb
URIs: http://repo.r1soft.com/apt
Suites: stable
Components: main
Signed-By: /etc/apt/trusted.gpg.d/r1soft.asc 

3) Save and exit this file.

4) Lastly, run apt update to download the latest information about the packages in the new repository:

 # apt-get update   

Steps for legacy Operating Systems, such as Ubuntu 20.04, Debian 10 or older.

1) First, modify /etc/apt/sources.list to include the R1Soft repository.

 # echo "deb http://repo.r1soft.com/apt stable main" >> /etc/apt/sources.list  

2) Next, download the R1Soft apt gpg key.

 # wget http://repo.r1soft.com/r1soft.asc  

3) Add the apt gpg key using the apt-key command:

 # apt-key add r1soft.asc  

4) Lastly, run apt-get update to download the information about the packages in the new repository:

 # apt-get update   