Take care

Sometimes, in ubuntu, when you are "root" and you're working with some files, we can delete by accident a very important folder or file. I'll explain how can we avoid that.

First of all, if you're working with the terminal, you have to be very careful with the names of the files, cause if you write something wrong and you're deleting some files ought to a old installation, because if you type the name incorrectly, you can delete another file. 

Also be careful when you copy or move files, because the most important is to type the route of the file or folder and where do you want to copy or move the file.