/usr/lib/x86_64-linux-gnu/libBasicUsageEnvironment.so.1 is in libbasicusageenvironment1 2018.02.18-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libBasicUsageEnvironment.so.1.0.1