Running Debian 8 Jessie I installed VirtualBox but it fails to start. No matter if I connect via PuTTY or locally on the machine, root or user, I always get the same error:
Failed to open the X11 display!
Following is set in /etc/ssh/sshd_config:
X11Fowarding yes X11DisplayOffset 10
Also, when connecting via PuTTY, X11 Forwarding is enabled and X display location set to
Xauth is installed, .Xauthority copied over to root too.
What could be wrong? Thanks in advance!