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upgrading Ubuntu 14.04 to 16.04.1. Prompted with Replace the customized configuration file '/etc/default/rcS'?

I am not sure what to do, keep or replace..? Thanks!

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The /etc/default/rcS file affects the behavior of the boot scripts. You can use the installation process to look at the difference between the two files if you are not sure if you have made any changes to the file.

When I'm not sure about a configuration file I usually drop into a shell and copy that file to something similar to rcS.old, then allow the overwrite so that I can later examine the changes and use both to create my best configuration file between the two.

Of course the options are:
(Example prompt)

Configuration file `/etc/bash.bashrc'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** bash.bashrc (Y/I/N/O/D/Z) [default=N] ? 
  • okay, what commands would I run to copy that file to a new location in case something happens that shouldn't? And then I can go ahead and overwrite, choosing replace, correct? – Kdrumz Aug 24 '16 at 5:02
  • @KyleDrummond There are a few ways. I usually hit ALT+CTL+F2 to drop into a shell. But as you can see from the default prompt, it gives and option Z to start a shell to examine the situation. – L. D. James Aug 24 '16 at 5:08
  • okay, I don't have an option Z like the post above, but how do I copy the old file to a new location? Still new to Ubuntu a little and I don't want to mess this up. – Kdrumz Aug 24 '16 at 5:12
  • @KyleDrummond After hitting ALT-CTL-F2 to get a console prompt you could run cp /etc/defaults/rcS ~/rcS.old. Or you could make a backupfolder and copy the file to your backup folder such as cp /etc/defaults/rcS ~/configfolder/. – L. D. James Aug 24 '16 at 5:17
  • Okay thanks! I will run the first command in terminal, then just hit replace? – Kdrumz Aug 24 '16 at 5:34

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