先说一句：我可能是一只猪......
Do not know why, when I installed ubuntu dual system of points to the root directory space only 10G, simply beep dog, not how to use the two days only 400M role, and a variety of online way to find the root of expansion once Baidu had a problem:
How Linux root directory of the expansion of
Linux disk partition management
ubuntu disk partition management
And so on ......
100 method 99 are talking about how to manage the command line, I also have a careless look lost in a graphical user interface
Closer to home
on how to fool disk partition management under ubuntu
Open the graphical user interface for all applications (on the left side of the application bar a few points), find the Tools folder (utilities) 
the middle of this cargo, the legendary disk management tool (Disks)
after the user interface is so open, that is, the leftmost your hard drive, I do not have to shoot out. First select the hard disk to operate, then select the partition (or free space) corresponding, then click the mouse at the location that the mouse following menu pops up, then that is the same as the operation of the windows above
In fact, I started saying that I want to use cfdisk merge the free partition, but do not know why, after writing df view the results is no expansion, lsblk look like and indeed is the expansion of, and made me look ignorant force, I suspect the reason is because there is no formatting, but I can not format the root of it, after all, your computer can not delete something and ran the road, found the back of this tool, it is already time to see the expansion, directly resize the I did not make any changes on the success of the expansion of the root directory
所以说，不要和我讲什么命令行、逻辑卷组之类的东西，讲就是听不懂，我一个图形用户界面打天下