Auto-Connecting Ubuntu to Ad-Hoc Connection
The Odroid U3 has Ubuntu 14.04 LTS Desktop version installed on its eMMC card.
In order to have an ad-hoc connection automatically connected on boot of the OS do the following steps:
/etc/network/interfaces, add these lines to the bottom and make sure there is no other configuration for your WiFi interface.
auto wlan3 iface wlan3 inet static address 192.168.1.1 netmask 255.255.255.0 wireless-essid odroid wireless-mode ad-hoc wireless-key 1234567890
/etc/NetworkManager/NetworkManager.conf, this should be a template for how to restrict the Network Manager to manage your WiFi interface.
[main] plugins=ifupdown,keyfile,ofono dns=dnsmasq [ifupdown] managed=false [keyfile] unmanaged-devices=mac:00:13:d4:c0:62:db
00:13:d4:c0:62:dbis my WiFi interface MAC address.