Ubuntu长时间待机Wifi无法连接的解决办法：
1.重启网络
sudo service network-manager restart
2.修改配置文件
在/etc/default/acpi-support 里面找到 # Add services to this list to stop them before suspend and restart them in # the resume process.
STOP_SERVICES=""
替换为：
STOP_SERVICES="networking"