I just want to set to default
/etc/network/interfaces but I can't because I get a
Permission denied error when I try to write to it:
auto lo iface lo inet loopback
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In Ubuntu or Linux in general, files inside root
/ is owned by root. A user would therefore need root privileges to access those files.
Since you're trying to write to
/etc/network/interfaces file, you do need to be root or have root privileges. To do so, use the
sudo command which is used to perform file operations on files that the Root User would only be allowed to change.
Open a terminal with Ctrl+Alt+T and run:
sudo gedit /etc/network/interfaces
This will open Gedit, you can then make the necessary changes to the file.
Note: Since Gedit is a graphical application, it is recommended to run
sudo graphically with
gksu. Therefore, you can also do it this way:
gksu gedit /etc/network/interfaces