Raspberry Pi A User Manual page 108

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To make sure that the network is operational, unplug the Pi's Ethernet cable (if attached)
and type the following:
ping -c 1 www.raspberrypi.org
If you start having problems with your Pi following the installation of a USB wireless adapter,
TIP
it could be due to a conflict with other USB devices. Some adapter models are known to
cause problems with certain USB keyboards. For an up-to-date list of adapters that are known
to be good, as well as those that are known to cause conflicts, visit www.element14.com/
community/docs/DOC-44703/l/raspberry-pi-wifi-adapter-testing
eLinux wiki at http://elinux.org/RPi_USB_Wi-Fi_Adapters.
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