Here are some env var settings to try:
export QT_OPENGL="desktop"
Then try launching Sigil in that terminal
You could also try using ANGLE via
export QT_OPENGL="angle"
Then try opening Sigil in that terminal session.
and lastly you could try software opengl emulation
export QT_OPENGL="software"
Then try running Sigil from that terminal session.
Do any of these impact the error you are getting?
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