http://forum.ubuntu.org.cn/viewtopic.php?f=126&t=221850
sudo apt-get install nvclock
nvclock -S +10
nvclock -S -10
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http://forum.ubuntu.org.cn/viewtopic.php?f=126&t=221850
sudo apt-get install nvclock nvclock -S +10 nvclock -S -10 
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