Next up we install the software onto the Pi that will act as the ‘hostap’ (host access point) You need internet access for this step so make sure that Ethernet connection is up! sudo apt-get update sudo apt-get install hostapd isc-dhcp-server (You may need to sudo apt-get update if the Pi can’t seem to get to the apt-get repositories)

Source: Install software | Setting up a Raspberry Pi as a WiFi access point | Adafruit Learning System