It'll be activated immediately after installing.
YOU MUST REBOOT YOUR DEVICE BEFORE YOU CAN USE YOUR PHONE AS A SHARED FOLDER If you install the .deb and then try and turn on network access, it'll constantly just change itself back to 'off'.
This package adds native Windows networking support for your iPhone, iPod or iPad.
Your device will appear in Windows' network locations, and you will be able to browse & transfer files from/to it seamlessly, as you would do with another Windows computer.
The configuration is done in Settings.
NOTE: when the device goes into sleep mode, Wifi is disabled. PC Networking uses Wifi, so it needs your device to be awake in order to be accessible.
See the Screenshots below