/usr/lib/x86_64-linux-gnu/libtcl8.6.so.0 is in libtcl8.6 8.6.2+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtcl8.6.so
/usr/lib/x86_64-linux-gnu/libtcl8.6.so