/usr/lib/x86_64-linux-gnu/libGuiBld.so.5.34 is in root-plugin-gui-guibuilder 5.34.19+dfsg-1.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/root5.34/libGuiBld.so.5.34
/usr/lib/x86_64-linux-gnu/root5.34/libGuiBld.so.5.34