It's really easy to do, and I've got the easy Terminal instructions
below. BTW, the version of Nautilus current as of this post is 3.2.1.
You will probably need to do this any time Nautilus gets updated
through Update Manager. The exact line number of the code that needs
to change may vary as well. If this is the case, just use find as I
instruct below.
Warning: I am not a professional and am not responsible for anything
going wrong. These instructions are simply a guide for how I
personally managed to fix this annoyance. Use at your own risk.
First off, you may need to enable the "Source code" repository. To do
this in Ubuntu, press the Super/Windows key and type "Source". Open
the "Software Sources" application from the results. Check the box
before "Source code", then click close.
From Terminal:
mkdir ~/Desktop/nautilus-mod
cd ~/Desktop/nautilus-mod
sudo apt-get update
apt-get source nautilus
sudo apt-get build-dep nautilus
cd ~/Desktop/nautilus-mod/nautilus-3*
gedit src/nautilus-toolbar.c
Now, scroll down to line 132 or do a "find" for
gtk_toolbar_insert (GTK_TOOLBAR (self->priv->toolbar), > item, 0)
and change the 0 to a 2. So change the original line
from:
gtk_toolbar_insert (GTK_TOOLBAR (self->priv->toolbar), item,> 0);
To
gtk_toolbar_insert (GTK_TOOLBAR (self->priv->toolbar), item,> 2);
When you're done, click save and close Gedit.
Back in Terminal, run the following:
./configure
make
sudo killall nautilus
sudo make install
nautilus &
At this point, I would actually recommend logging out and
back in or just restarting.
To undo the changes and revert back to stock Nautilus, you can either
change the "2" back to a "0", re-make and re-install, or you can
simply run:
sudo apt-get --reinstall install nautilus
You might want to remove the required dev packages also, but be careful not to remove
something that may have already been there and is needed.
Best Answer
Another solution is to install a different file manager, for example my personal favourite alternative (and very similar to nautilus) file manager is Caja. You can simply type "caja" into software center and download from there. Caja has no snap problems.
However, there are some other applications that have the snap in problem, such as Discord, that this will not fix.