This may help you a bit did a quick search 
Please read everything, Alex changed the package repository ...
Regarding the wifi problem:
-use version 0.9.0 of the SD card image
-follow the guide you mentioned at start (not the LSB-Image, the first solution regarding wpa-supplicant)
-telnet to your galileo (use the headphones like serial plug)
-login 'root'
-enter 'chmod 644 /etc/init.d/connman'
-kill connman daemon
-try 'ifconfig wlan0 up'
-if you can connect 'ifconfig' to your wlan do a 'reboot'
-that was my way to fix it but it is not a fine solution because connman should handle it
How to enable the Yocto-provided package management capability