can't open etc/network/interfaces : permission denied or something?
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Please create your own thread for your issue in the future.
I have moved your post to a thread of its own, so that your issue remains separate from that of the creator of the other thread. This makes it easier for LQ members to help each of you.
Now, about your problem: What user are you running as, when you try to open the file? It is extremely likely the file is owned by root, and not readable or editable by a non-root user.
You did not tell us what OS you are using (you should tell us this), but if it's an Ubuntu or Mint type of OS, you probably want to use `sudo`. If it's a different OS (Like RH or CentOS or SuSE maybe), then probably you want to use `su` and become root, then edit the file.
If these ideas fail, then show us the EXACT text, copied from your terminal, when you try to run your editor command, or if you're using some GUI editor, tell us the EXACT error that appears in the dialog box.
root@aprovisionamiento:/home/omar# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
iface lo inet loopback