Yes.  This bug probably means that lightdm is not associating the login
session's environment with the pam handle for the unlock action.  It
looks like lightdm correctly copies the contents of the pam env
(pam_getenvlist) to the session environment (judging by the $KRB5CCNAME
that I have in my environment here), but evidently it doesn't save this
information for later use for the unlock screen, which it needs to do.

A valid way to do this would be to keep the pam handle open for the
duration of the login session, and reference it for any unlock actions.

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https://bugs.launchpad.net/bugs/1336663

Title:
  lightdm uses wrong ccache name on pam_krb5 credentials refresh

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