Yes, I already figured out that it's missing libxcb-xinerama0, but since support is ending for Mint 18.3 at the end of March or April and I couldn't figure out what I needed to fix it (seems a common problem on the QT forums for years) and my test laptop with Mint 20.1 is OK, I decided to upgrade to 19.3 or 20.1
perhaps it's as simple as sudo apt-get install libxcb-xinerama0 on older versions of Mint, but I've been putting off upgrading anyway.
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