In the Software Manager, I'm getting an error message:
An error occurred
Error deploying: While trying to apply extra data: runtime/
org.freedesktop.Platform/x86_64/19.08 not installed

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sudo add-apt-repository ppa:cartes/drawing
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sudo apt update
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sudo apt install drawing
Thanks Damien. However I got an error after the second command:DAMIEN1307 wrote: ↑Sat Dec 14, 2019 4:02 pmHi Mark,
There’s also an unofficial Drawing PPA that packages the latest version for Ubuntu 18.04 LTS, Ubuntu 19.04 and Ubuntu 19.10: –
...
Maybe this might be of help in the meanwhile...DAMIEN
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sudo apt update