sudo add-apt-repository ppa:thopiekar/cura sudo apt-get install cura
We need a fairly recent install to get support for my Tronxy-3 printer. Thopiekar's repo was updated 22 days ago (it's 2021/04/20) and has the support.
Mean-meanwhile... Cura says to use their snap...
sudo snap install cura-slicer
TODO Once this simmers or I succumb to snaps, set up [mh-install-cura].