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Don't panic, but Linux's Systemd can be pwned via an evil DNS query
How to Crash Systemd in One Tweet
etc, etc, etc

The software itself was adopted way to early and is not at all mature. The attack surface is immense and growing. EWONTFIX has achieved "meme" status within SystemD. And the author(s) appear to have little appreciation for stability or security. If ever there was a Linux application that sought to employ the "embrace, extend, extinguish" strategy developed by Microsoft, this is it. I feel the Linux community has begun to better understand this. My two cents, anyway.

why would we waqnt to stay away from systemd? is it a virus or instability issue?

Systemd is a mess. It is allegedly an attempt to replace init.d with something more robust. However, it is a freaking mess that is really hard to follow. Whereas before, you could take a look at the desired runlevel directory (i.e., rc3.d) and could get a really good feel with just a glance at it of the order in which everything was going to start, now it's a spaghetti bowl of crap that you really can't trust.

Things will fork off, with a myriad of dependencies such that you can't be guaranteed from one boot to the next whether a system is going to come up cleanly or not.

Logging with systemd is binary, so you can't just look at syslog and read through the information to determine what went wrong and why.

Finally, a number of packages have bought into the whole systemd, such that you now have a crapload of things tied into your init system, that really have no need to be. This can cause breakage that is really hard to track down.

The reason why some would want to stay away from systemd are numerous, here is a link to a page against systemd.
http://without-systemd.org/wiki/index.php/Arguments_against_systemd

The advantages of systemd are a faster boot than sysVinit and Upstart and being easier to get services restarted that have quit.

JULinux is a respin distro, the most recent version is based on Ubuntu MATE 16.04 LTS xenial. It has a different default theme and different wallpaper than Ubuntu MATE 16.04 Here is the link. https://sourceforge.net/projects/ultumix/