I am also an Ubuntu LTS user, but more a developer than a system administrator.
I have migrated from 14.04 LTS to 16.04 recently. I am using a NAS drive. After my do-release-upgrade -d, internet was not working anymore because of systemd circularity problem. I had to learn how to create systemd configuration files to describe remote filesystem mounts. It was not easy to find documentation on systemd.
When my computer enters in sleep mode, I can wake it with a press on enter. The next time, it enters in sleep mode, I can not wake it up anymore.
My system used to boot in high resolution. Now, it is using huge fonts that makes boot message impossible to read (25 lines on a 23" screen!). I still do not know how to fix it.
It may not be only the fault of systemd, but migration from 14.04 LTS to 16.04 LTS was a very bad experience for me.
Ubuntu upgrades almost always suck, but the upgrade from 14.04 to 16.04 was the worst I ever saw. Nothing worked, my system was broken beyond rescue. Pulseaudio all over again.
