make install_go fails on Ubuntu Groovy

On Ubuntu Groovy, the 'make install_go' fails because there is go packages for this distribution.

This deb line works

deb http://ppa.launchpad.net/longsleep/golang-backports/ubuntu/ bionic main

This doesn't work on Groovy

deb-src http://ppa.launchpad.net/longsleep/golang-backports/ubuntu/ groovy main

$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.10 Release: 20.10 Codename: groovy