Notes
How to run FlashPrint on Linux with Qt5.10+
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Download Qt 5.9.5 and install into /opt/Qt5.9.5
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Edit execution line of /usr/share/applications/FlashPrint.desktop file to start software with the older Qt:
Exec=env LD_LIBRARY_PATH=/opt/Qt5.9.5/5.9.5/gcc_64/lib /usr/share/FlashPrint/FlashPrint