Comment 9 for bug 210897

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In , Halton Huo (halton-huo) wrote :

Check with the Ubuntu bug, it guess it is similar with the following case in Solaris:
$su -
<input your root password>
#env|grep XDG
#gdmflexiserver

If we use "su" instead of "su -" in upper case, the XDG_SESSION_COOKIE is retained. So gdmflexiserver can start without error.

If you have unset XDG_SESSION_COOKIE in your ~/.bashrc explicitly, that is user mistake. I'd say this is not a bug.