Install this debian package to add this repo to your debian or ubuntu computer:

https://apt.mxrap.com/ubuntu/mxrap-ubuntu-archive_latest.deb

You can do it like this:

• wget https://apt.mxrap.com/ubuntu/mxrap-ubuntu-archive_latest.deb
• sudo dpkg -i mxrap-ubuntu-archive_latest.deb
• sudo apt update
• THEN install mXrap: apt install mxrap