Systemd doesn't import all environment variables on Ubuntu 16.04?

[Khurshid Alam]

Hi,

Ubuntu doesn't install dbus-user-session package by default. But it has 
dbus-x11 installed by default. When I try "systemctl --user 
show-environment" it only shows few env variables. However "initctl 
--user list-env" shows them all properly.

$ ps -p1 | grep systemd > /dev/null && echo systemd || echo upstart
systemd

$ systemd --v
systemd 229

$ systemctl --user show-environment
HOME=/home/pcuser
LANG=en_IN
LANGUAGE=en_IN:en
LOGNAME=pcuser
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
SHELL=/bin/bash
USER=pcuser
XDG_RUNTIME_DIR=/run/user/1000

All I need is "DBUS_SESSION_BUS_ADDRESS", "DISPLAY" and "XAUTHORITY". 
Even without dbus-user-session, it should import all environment 
variables as it is executing "dbus-update-activation-environment 
--verbose --systemd --all" from xsession.d script. Is it not? Then why 
is it not importing all the variables?

Please clarify.
Thanks.
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