Forticlient 6.4 (SSLVPN) not working on Ubuntu 18

Hi all,

      i have install fortiClient 6.4 on ubuntu and try to connect VPN connection profile. but not working. it's error "failed to set readential. connot autolaunch D-Bus without X11 $DISPLAY"

log detail:

------------ Create VPN Profile ERROR"Failed to save client certificate password. Cannot autolaunch D-Bus without X11 $DISPLAY"-------------------------------------- administrator@forticlient01:~$ /opt/forticlient/fortivpn edit CTH-VPN-SSL ===================== Create new VPN profile: CTH-VPN-SSL ===================== Remote Gateway: XXX.XXX.XXX.XXX Port [default=443]: 10443 Authentication (1.prompt / 2.save / 3.disable) [default=1]: 2 Username: username Client Certificate (.p12 file URL) [default=None]: Do not Warn Invalid Server Certificate (y/n) [default=n]: y Failed to save client certificate password. Cannot autolaunch D-Bus without X11 $DISPLAY DONE. administrator@forticlient01:~$ ------------------------------------------------------------------------ Check SSLVPN profile-------------------------------------------------- administrator@forticlient01:~$ /opt/forticlient/fortivpn list VPNs: Personal VPNs: CTH-VPN-SSL

------------------------------------------------------------------------ Connect SSLVPN -------------------------------------------------- administrator@forticlient01:~$ /opt/forticlient/fortivpn connect CTH-VPN-SSL Connect VPN: CTH-VPN-SSL password: Failed to set creadential. Cannot autolaunch D-Bus without X11 $DISPLAY DONE. administrator@forticlient01:~$

Cloud you please advice to fix this problem?

thank a lot.