Problems with ttkbootstrap on linux

[ghost]

I have been using ttkbootstrap successfully on windows 11 but decided to try out Linux (Debian) as a working environment.
When I and run my app that uses ttkbootstrap there is an error that tkinter is not installed.
When I 'pip list', the installed modules are the same as on windows.
Any idea what I am doing wrong?
thanks
karl

[ghost]

Ok, so realised that tkinter is not installed by default on linux.
Had to so 'sudo apt install python3-tk'