1

Here is the terminal log.

http://pastebin.com/xTEK13B7

How do I fix it? What does it do? Is it safe or okay?

2

Nautilus is a graphical application so you ought to use gksudo instead :

gksudo nautilus

When you want to do graphical things with high prilivegies, gksudo and gksu are much more convinient than sudo and su.

0

It is an uncritical message; nautilus should run normally; for reference see this report at launchpad.

0

In Ubuntu 18.04 gksudo is gone.

Instead, try:

sudo -H nautilus

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