> The Kernel posted by Chris allows, (with console login), the user to unlock 
> the 
> screensaver

Well, this seems to fix the original bug reported here. Which is that
nobody can log in using LDAP / Kerberos once a ticket of one signed in
user expired.

> but applications, such like web browser, remains stuck and the session has to
> be restarted in order to work properly.

This looks like the intended behavior to me. The user's Kerberos Ticket
expires some time after log in. At that point the applications can no
longer access the user's NFS home directory and the applications get
stuck or crash. Once a user enters his / her password again a new ticket
is granted and the user can log into the session /access the home
directory again.  However, in my experience few applications fully
recover from not being able to access the home directory for a longer
time.

So, it seems to me, that in order to fix this remaining issue one needs
to set up something to automatically renew Kerberos Tickets. This can be
implemented either via a cronjob or packages like kstart or sssd.

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https://bugs.launchpad.net/bugs/794112

Title:
  Kerberos + LDAP + NFSv4 on Natty - Unable to recover unattended client

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