Install AppImageLaucher

Open your terminal.

sudo apt install software-properties-common

For debian download the official .deb package for AppImageLauncher:

wget https://github.com/TheAssassin/AppImageLauncher/releases/download/continuous/appimagelauncher_2.2.0-gha111.d9d4c73+bionic_amd64.deb

Now, try installing the downloaded package again using dpkg:

sudo dpkg -i appimagelauncher_2.2.0-gha111.d9d4c73+bionic_amd64.deb

If you encounter any missing dependency errors during the installation, you can try running:

sudo apt-get -f install

Once the installation is successful, you can update the desktop database:

update-desktop-database

This should install AppImageLauncher on your Debian system.