22、Download updates faster(选择最快的软件源)
Click System ! Administration ! Software Sources. Click the Download From dropdown list and then select Other. In the list of servers, choose any you wish. You’ll need to reload the package lists from the server when prompted.
26、Ensure always knows the time(系统时间自动与网络同步)
use Synaptic to install the ntp package. Once the package is installed, restart your computer. Configuration is automatic.