E: GPG error: https://mirrors.oschina.net trusty-backports InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)E: GPG error: https://mirrors.oschina.net trust
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E: GPG error: https://mirrors.oschina.net trusty-backports InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
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