Install latest/stable of Fingerpaint
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install fingerpaint
Don't have snapd? Get set up for snaps.
This utility lets you draw using your laptop's touchpad. Pressing any key or clicking the touchpad will finish the drawing. Your touchpad will not control the cursor while drawing, though external mice should still work. It has support for both X11 (all desktop environments), and Wayland (just Gnome at the moment).
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.