/usr/lib/erlang/ is in erlang-webtool 1:16.b.3-dfsg-1ubuntu2.2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/erlang/lib/
/usr/lib/erlang/lib/webtool-0.8.9.2/
/usr/lib/erlang/lib/webtool-0.8.9.2/ebin/
/usr/lib/erlang/lib/webtool-0.8.9.2/ebin/webtool.app
/usr/lib/erlang/lib/webtool-0.8.9.2/ebin/webtool.appup
/usr/lib/erlang/lib/webtool-0.8.9.2/ebin/webtool.beam
/usr/lib/erlang/lib/webtool-0.8.9.2/ebin/webtool_sup.beam
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/bin/
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/bin/start_webtool
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/root/
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/root/conf/
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/root/conf/mime.types
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/root/doc/
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/root/doc/index.html
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/root/doc/start_info.html
/usr/lib/erlang/lib/webtool-0.8.9.2/priv/root/doc/tool_management.html