refresh or redraw the screen if some UI element (eg the taskbar) is broken in ubuntu (gnome?)? do this by alt f2, r.
ubuntu ui frozen (probably because you messed something up in python?)
Ctrl Alt F2 (or f3, or etc) to open command line only, use
top's L to locate string (usually python or code are culprits),
k to sigterm a pid (or 9 for sigkill)
https://blog.logrocket.com/css-breakpoints-responsive-design/: really good article on css breakpoints
installing gnome extensions with the recommended method is broken by default on ubuntu 22. Use the extension manager application instead. (stackoverflow)
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