LightDM is already able to create the xauthority file locally under
$XDG_RUNTIME_DIR, using configuration option user-authority-in-system-
dir. This option is off by default on Ubuntu 16.04/18.04, but can be
enabled with
# echo -e '[LightDM]\nuser-authority-in-system-dir=true'
see also bug 685194
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https://bugs.launchpad.net/bugs/1648107
Title:
$XAUTHORITY should move into $XDG_RUNTIME_DIR
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While we are at it, we could probably also set
ICEAUTHORITY=$XDG_RUNTIME_DIR/ICEauthority
in a similar fashion, as this is the equivalent cookie facility for X11
client-client communication.
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As a workaround, install the attached shell script as
/etc/X11/Xsession.d/10local-xauthority
It uses xauth to merge ~/.Xauthority into $XDG_RUNTIME_DIR/xauthority
and then updates XAUTHORITY to point at that location.
(Note that the "xauth merge" command will leave a warning such as
"xauth:
** Changed in: lightdm (Ubuntu)
Status: New => Triaged
** Changed in: lightdm (Ubuntu)
Importance: Undecided => Medium
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Title:
