How to Install UMLet on Ubuntu Linux
UMLet is available as a flatpak package file from flathub. First you need to install the latest version of flatpak and flathub on your system using below installation instruction link. Restart your system after the installation.
Now in the terminal app (ctrl+alt+t) run below UMLet flatpak installation command. It will install the latest version of UMLet on your system.
flatpak install flathub com.umlet.Umlet
Then start UMLet using this command.
flatpak run com.umlet.Umlet
And uninstall UMLet using
sudo flatpak uninstall com.umlet.Umlet