/usr/lib/x86_64-linux-gnu/libGuiHtml.so.5.34 is in libroot-gui5.34 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/libGuiHtml.so.5.34
/usr/lib/x86_64-linux-gnu/root5.34/libGuiHtml.so.5.34