How to install avidemux3 on Ubuntu 22.04

You can install Avidemux 3 (QT) from the xtradebs PPA:

sudo apt -y install software-properties-common apt-transport-https -y
sudo add-apt-repository -y ppa:xtradeb/apps
sudo apt -y install avidemux-qt

After that, run

avidemux3_qt5

to run Avidemux 3.