user1631: I am using Linux Fedora 20 (yes I am going to upgrade it, definitely, soon) and I have installed arduino-1.8.0, but I get this message ...  

Your copy of the IDE is installed in a subfolder of your sketchbook.
  Please move the IDE to another folder

... when I click on the desktop icon, or run ./arduino. I have tried moving the tar.xz file to its own folder ArduinIDE again installed it but get the same message. Please,what should I do to get out of this? Please no answers like "just do what it says":in that case what do I move, and what criteria does the destination need to have?

user4143: Delete (or edit) your preferences.txt file - it most likely has your sketchbook folder set to your home directory.
You may find it in ~/.arduino15 for the "real" Arduino IDE, or in (I think) ~/.arduino for the arduino.org one.
Unless you have a specific reason for wanting to run 1.8.0, which is actually 1.0.6 re-numbered, you should be using the version from arduino.cc which is currently 1.6.13.

1631: <p>I am using Linux Fedora 20 (yes I am going to upgrade it, definitely, soon) and I have installed arduino-1.8.0, but I get this message ...  </p>

<blockquote>
  <p>Your copy of the IDE is installed in a subfolder of your sketchbook.
  Please move the IDE to another folder</p>
</blockquote>

<p>... when I click on the desktop icon, or run ./arduino. I have tried moving the tar.xz file to its own folder <code>ArduinIDE</code> again installed it but get the same message. Please,what should I do to get out of this? Please no answers like "just do what it says":in that case what do I move, and what criteria does the destination need to have?</p>
 4143: <p>Delete (or edit) your <code>preferences.txt</code> file - it most likely has your sketchbook folder set to your home directory.</p>

<p>You may find it in <code>~/.arduino15</code> for the "real" Arduino IDE, or in (I think) <code>~/.arduino</code> for the arduino.org one.</p>

<p>Unless you have a specific reason for wanting to run 1.8.0, which is actually 1.0.6 re-numbered, you should be using the version from arduino.cc which is currently 1.6.13.</p>
