Install packakes pykaraoke and timidity
apt install pykaraoke timidity
In Mint 20 has no pykaraoke package, so install Ubuntu 18.04´s version
https://ubuntu.pkgs.org/18.04/ubuntu-universe-amd64/python-pykaraoke_0.7.5-1.2_amd64.deb.html
https://ubuntu.pkgs.org/18.04/ubuntu-universe-amd64/pykaraoke-bin_0.7.5-1.2_all.deb.html
https://ubuntu.pkgs.org/18.04/ubuntu-universe-i386/pykaraoke_0.7.5-1.2_all.deb.html
The next packages:
http://archive.ubuntu.com/ubuntu/pool/universe/p/pykaraoke/python-pykaraoke_0.7.5-1.2_amd64.deb
http://archive.ubuntu.com/ubuntu/pool/universe/p/pykaraoke/pykaraoke-bin_0.7.5-1.2_all.deb
http://archive.ubuntu.com/ubuntu/pool/universe/p/pykaraoke/pykaraoke_0.7.5-1.2_all.deb
Make links to /usr/local/bin
sudo ln -s /usr/games/pykaraoke /usr/local/bin
sudo ln -s /usr/games/pykaraoke_mini /usr/local/bin
Delete wrong symbolic links and copy fonts from /usr/share/fonts/truetype/dejavu
to
/usr/share/pykaraoke/fonts
Download karaoke-songs from rpm.pbone.net and extract rpm-package and add songs to the Pykaraoke´s database.
http://rpm.pbone.net/resultsb_dist_50_size_19289461_name_karaoke-songs2-0.1-2pclos2012.src.rpm.html
Pykaraoke is running
PS. After rebooting menu finds the right lauchers for Pykaraoke and Pykaraoke Mini