/usr/lib/x86_64-linux-gnu/libtcl8.4.so.0 is in libtcl8.4 8.4.20-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtcl8.4.so
/usr/lib/x86_64-linux-gnu/libtcl8.4.so