Suddenly systemctl stopped to work while I ssh'ed in my remote server to check service status. Output was
Failed to list units: Launch helper exited with unknown return code 1
I discovered that now upstart is used (after a couple of reboots trying to make systemctl work).
Can I use systemd as my main init again? I didn't found any info how to switch from upstart to systemd here.
Ubuntu 16.04.5.
First, it is important to note that systemd is only fully supported in Ubuntu 15.04 and later releases. While systemd is available in prior releases through the Ubuntu repositories, there is a deemphasis of support for these releases as noted here. Hence, it is advised to use the default upstart on prior releases.– George Udosen May 09 '19 at 12:26