Installing
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2. Enabling HeeksCAD PPAAdd HeeksCAD PPA for Ubuntu GNU/Linux 
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3. Installing HeeksCADThen to Install HeeksCAD on Ubuntu 
 Simply run:sudo apt install heekscnc Or: sudo apt install heekscad 
Contents
$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }
Add HeeksCAD PPA for Ubuntu GNU/Linux
Then to Install HeeksCAD on Ubuntu
Simply run:
sudo apt install heekscnc
Or:
sudo apt install heekscad