/system/media/audio/ringtones 来电铃声
/system/media/audio/notifications 短信通知铃声
/system/media/audio/alarms 闹钟铃声
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nginx报错nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) 仔细参考nginx中文文档发现，发送信号USR2时，自动启动新的可执行文件，再手动启动的话就会报错 本质上也算是一种地址冲...
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The Vps is too old to get a newer OS from the provider. create /etc/apt/sources.list.d/jessie-backports.list, and fill in the following line...
