Some wireless devices have problems handling when your computer is suspended and does not resume properly.
GNOME ドキュメンテーションプロジェクト
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Ekaterina Gerasimova
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松澤 二郎
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赤星 柔充
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Kentaro KAZUHAMA
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日本GNOMEユーザー会
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# I have no wireless network when I wake up my computer

If you have suspended your computer, or it has hibernated, you may find that your wireless internet connection does not work when you resume it again. This happens when the driver for the wireless device does not fully support certain power saving features. Typically, the wireless connection fails to turn on properly when the computer is resumed.

If this happens, try switching your wireless off and then back on again:

Click your name on the top bar and select System Settings

Open Network and select the Wireless tab

Switch the wireless off and then on again

If the wireless still does not work, switch on Airplane Mode and then switch it off again

If this does not work, restarting your computer should make the wireless work again.