systemctl --user enable SERVICE to start the service on login, which is not happening. Then what is it supposed to mean?
It makes the unit start on first login of a user, but for that corresponding unit file should have
WantedBy = default.target or something along the lines. Because when user instance of
systemd starts, it brings up the
systemctl --user enable SERVICE will do nothing unless the related unit file has an
[Install] section. the
[Install] section lets
systemd know which symlinks to set up with
enable is used. From the docs:
Unit files may include an "[Install]" section, which carries installation information for the unit. This section is not interpreted by systemd(1) during runtime; it is used by the enable and disable commands of the systemctl(1) tool during installation of a unit.