I think https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756247#53 gave the root cause and a workaround(see comment #58 at the same link...)
And, root@decui-VM:~# systemctl Failed to get D-Bus connection: No connection to service manager. root@decui-VM:~#
I think https:/ /bugs.debian. org/cgi- bin/bugreport. cgi?bug= 756247# 53 gave the root cause and a workaround(see comment #58 at the same link...)
And,
root@decui-VM:~# systemctl
Failed to get D-Bus connection: No connection to service manager.
root@decui-VM:~#