Is there any open source program for remote desktop to connect to PC from android device.
(Open source alternative to TeamViewer) 
You might look at anydesk.com. I find it better than TeamViewer. You could also look at Remmnia under internet in software boutique. Good luck.
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You might try AirDroid. Connects both ways if I remember correctly.
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[quote=“mdooley, post:3, topic:13939, full:true”]
(…) Connects both ways if I remember correctly.
[/quote]Did you mean that I can interact from the computer with the android device and from the android device with the linux computer? 
Airdroid is not compatible with linux (such as Ubuntu Mate). It didn’t work in both ways. But thank you for your time.
It’s more like a file sharer. Teamviewer, X2go, Remmina, can operate a machine remotely. It looks like AirDroid really only goes one way, ‘managing’ your android device from your computer. https://www.airdroid.com/
I detest ‘typing’ wth my thumbs. Sorry if this was not what you wanted.