# Ubuntu – How to start GNOME session from chainroot

virtualization

I have used cowbuilder to set-up a chainroot with ubuntu+1 (essentially minimal ubuntu installation in a sub-folder, which you can "change" into, for example for building packages in a clean environment).

How can I start gnome-session from there? Ideally I want it to appear on a new VT. I hope to achieve poor-man's virtualisation 😉

You should be able to do this with a combination of startx and /etc/X11/Xsession, as long as you've got the necessary trees bind-mounted (I'd guess that you'll need /dev, /sys, and /proc)

Chroot into your… chroot and run

sudo startx bash


which should give you an X term with a shell. To start a GNOME session you can simply run

/etc/X11/Xsession


from that shell.

You should be able to get this on the VT of your choice; check out the man page for startx for this, and other potentially interesting options.

Note that this doesn't make for a secure chroot - since /proc and /sys and /dev are mounted in the chroot a sufficiently advanced malicious user break out of the chroot with ease.