/usr/lib/x86_64-linux-gnu/libuser.so.1 is in libuser1 1:0.62~dfsg-0.1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libuser.so.1.5.2
/usr/lib/x86_64-linux-gnu/libuser.so.1.5.2