Thanks for the replies DiapDealer and KevinH.
I installed the qt6-l10n-tools package, made a new sigil-build directory and completed the cmake, make, make install with no apparent problems (ignoring the 'not found' comments).
I then tried to run Sigil from my existing desktop setup and also from a terminal. Both resulted in a 'Sigil has encountered a problem. Sigil may need to close.'
The details were:
Error info: Fatal: Could not find QtWebEngineProcess
Sigil version: 2.0.2
Runtime Qt: 6.2.4
Compiled Qt: 6.2.4
System: Ubuntu 22.04.3 LTS
Architecture: x86_64
I checked in the system monitor and there was no Qt process running. So however that process gets launched is not working correctly.
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