1: add respo (?)
sudo add-apt-repository ppa:noobslab/apps
During try to use Beeware, to pack the app with AppImage must under the environment of Ubuntu 16.04, and the simple way is run in container.
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After installed the Linux Mint 19.3 onto the Dell laptop, update and upgrade the apt & apt-get repo:
sudo apt update && apt upgradesudo apt-get update && apt-get upgrade