/usr/lib/x86_64-linux-gnu/libcurl.so.4 is in libcurl3 7.35.0-1ubuntu2.20.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcurl.so.4.3.0
/usr/lib/x86_64-linux-gnu/libcurl.so.4.3.0