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Answer on Question - I am facing error with my internet connection

Above is the link to a fix to help with a loss of connection after power saving mode. It says "open with sudo..." How does one do that if one is a complete novice and knows nothing?

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    That means open that file with say the text editor nano but ensure you use root powers to edit it or it won't save. How, do: sudo nano /etc/NetworkManager/NetworkManager.conf. This is necessary because that file can only be edited by one with root power
    – George Udosen
    Apr 25, 2017 at 10:54

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The answer you provided in the link wants you to open a file with root privileges, which can be achieved using these two commands 

sudo nano /path/to/your/file.foo

in the command above you are opening file.foo in a command based text editing tool called nano, In your particular case this command should work.

sudo nano /etc/NetworkManager/NetworkManager.conf

or

gksu gedit /path/to/your/file.foo

In this command you're opening the same file with a GUI based text editor called Gedit (default on Ubuntu and Ubuntu GNOME), In your particular case, this command should work

gksu gedit /etc/NetworkManager/NetworkManager.conf

Note

Use sudo for command line programs (like nano), but use gksu or gksudo for GUI programs, which often use configuration files in the home directory. If you use plain sudo, the root user can take ownership or your user ID's configuration files and the program used that way will stop working (unless you continue using sudo). An alternative to gksu and gksudo is sudo -H

An explanation for commenting out is to add a hash # sign in front of the line, in the example you gave, the line 

dns=dnsmasq

should become

#dns=dnsmasq
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    @Summet Deshmukh. No need; your answer is fine.
    – jarleih
    Apr 25, 2017 at 16:12
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    @SumeetDeshmukh the editor it opens can be configured. It can be Vim, nano, gedit, sed, true, or whatever you want it to be.
    – muru
    Apr 26, 2017 at 3:58
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    To make it slightly more confusing, if you are using Ubuntu GNOME (or I guess Ubuntu 17.10 when comes out, which will use GNOME) and are using the "GNOME on Wayland" session option you will not be able to use sudo -H gedit - because Wayland has stricter security policies and won't allow root to own a window in a non-root session. A workaround is to log out, then log in using the non-Wayland option.
    – seanlano
    Apr 27, 2017 at 23:25
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    Use sudo for command line programs (like nano), but use gksu or gksudo for GUI programs, which often use configuration files in the home directory. If you use plain sudo, the root user can take ownership or your user ID's configuration files and the program used that way will stop working (unless you continue using sudo). An alternative to gksu and gksudo is sudo -H
    – sudodus
    May 6, 2017 at 17:49
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    Yes, if you wish :-)
    – sudodus
    May 6, 2017 at 17:52
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That means open that file with say the text editor nano but ensure you use root powers to edit it or it won't save. How, do: 

sudo nano /etc/NetworkManager/NetworkManager.conf

This is necessary because that file can only be edited by one with root privilege. You will be asked for your password which you have to give so the file will open in nano editor.

After editing it to save it:

  1. ctrl + o
  2. enter
  3. ctrl + x
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