/usr/lib/gambas3/gb.qt4.ext.so.0 is in gambas3-gb-qt4-ext 3.8.4-2ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gambas3/gb.qt4.ext.so.0.0.0
/usr/lib/gambas3/gb.qt4.ext.so.0.0.0