/usr/lib/systemd/ is in gpg-agent 2.2.4-1ubuntu1.2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/systemd/user/
/usr/lib/systemd/user-environment-generators/
/usr/lib/systemd/user-environment-generators/90gpg-agent
/usr/lib/systemd/user/gpg-agent-browser.socket
/usr/lib/systemd/user/gpg-agent-extra.socket
/usr/lib/systemd/user/gpg-agent-ssh.socket
/usr/lib/systemd/user/gpg-agent.service
/usr/lib/systemd/user/gpg-agent.socket
/usr/lib/systemd/user/sockets.target.wants/
/usr/lib/systemd/user/sockets.target.wants/gpg-agent-browser.socket
/usr/lib/systemd/user/sockets.target.wants/gpg-agent-extra.socket
/usr/lib/systemd/user/sockets.target.wants/gpg-agent-ssh.socket
/usr/lib/systemd/user/sockets.target.wants/gpg-agent.socket