# <-- the # means this is a comment you don't need to type this in
# remember "silence is success" if a command prints output something didn't work
# stop and ask before proceeding to the next
# create a directory on which to attach the installed system
sudo mkdir /ubuntu;
# mount the installed system to that directory
sudo mount /dev/sda1 /ubuntu;
# bind mount some special filesystem
sudo mount --bind /dev /ubuntu/dev;
sudo mount --bind /sys /ubuntu/sys;
sudo mount --bind /proc /ubuntu/proc;
# jump into the installed system
sudo chroot /ubuntu;
# you should now have a root prompt "inside" the installed system on /dev/sda1