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[all variants] System unexpected sleep when connection to the mobile network

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linux-howto

http://ubuntuforums.org – Hi there! I'm currently facing an issue - my system very often goes sleeping unexpectedly. When this happens, I have my USB modem (Nokia) connected and I'm just making the Mobile Network connection enabled. The log file contains line: "Network manager: sleep requested". I would appreciate any help. Thanks. (Hardware)