Systemd service files

[J Doe]

Hi,

I have Ubuntu server 16.04 LTS deployed on one of my servers.  I have been working at slowly learning systemd but I ran into something that I hadn't expected.

When adding commonly used packages (Apache 2.4.x), I noticed that some of these packages have incomplete systemd service files.  In the case of Apache there is a systemd stub that then calls an init.d shim script.  As a result, on reboot, systemd shows a load failure (I am assuming from the incomplete service file), for Apache, but Apache is successfully started.  Controlling Apace post-boot is possible using the legacy apachectl command.

I have two questions:

-- Is the fact that not all packages have systemd service files due to the fact that 16.04 LTS is the first version of server to have systemd and systemd service files are slowly being added ?

-- Is there a rough timeline as to when most major pacakages will have systemd service files (ie: 18.04 LTS, etc.) ?

Thanks,

- J