root@ubuntu:/usr/lib/grub# sudo mount -t proc none /proc; mount -t sysfs none /sys
sudo: unable to resolve host ubuntu: Connection refused
mount: none is already mounted or /proc busy
       none is already mounted on /dev
       none is already mounted on /proc
       none is already mounted on /sys
mount: none is already mounted or /sys busy
       none is already mounted on /dev
       none is already mounted on /proc
       none is already mounted on /sys