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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: gksu and server
Date: Wed, 05 Dec 2018 12:47:22 -0500
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To: Michael Heerdegen <michael_heerdegen@web.de>
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Michael Heerdegen wrote:

>   signal(file-error ("Creating directory" "Permission denied"
> "/run/user/1000/emacs"))

I imagine due to
http://lists.gnu.org/r/emacs-diffs/2018-12/msg00010.html

> User 1000 is the one owning the X session - i.e. the wrong one.