sudo mount --bind /dev /chrootdir/dev
sudo mount --bind /sys /chrootdir/sys
sudo mount --bind /proc /chrootdir/proc
sudo mount --bind /dev/pts /chrootdir/dev/pts
sudo mv /chrootdir/etc/resolv.conf /chrootdir/etc/resolv.conf.bak
sudo cp /etc/resolv.conf /chrootdir/etc/resolv.conf
sudo chroot /chrootdir