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[ubuntu] etc/network/interfaces file editing

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linux-howto

http://ubuntuforums.org – Hello, Basic question, but hoping someone can help me out. I have edited a file in /etc/network, which is interfaces. When I pull up the file using gedit or nano the changes are shown in the file that is displayed. However when I look at the file in unity, there are no changes showing, also when I try to change the file in unity, it says I do not have permissions (I already changed permissions to make changes). Are there two files in /etc/network that unity only shows one? Also, if changes are not permanent, why has the file changed in the past (before I made changes and it permanently (Hardware)