/usr/lib/gambas2/gb.qt.ext.so is in gambas2-gb-qt-ext 2.23.1-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gambas2/gb.qt.ext.so.0.0.0
/usr/lib/gambas2/gb.qt.ext.so.0.0.0