/usr/lib/x86_64-linux-gnu/libtasn1.so.6 is in libtasn1-6 4.7-3ubuntu0.16.04.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtasn1.so.6.5.1
/usr/lib/x86_64-linux-gnu/libtasn1.so.6.5.1