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    # Fail if we don't have the kernel tun device
    # Make sure that the tun module is loaded (Ubuntu 7.10 needs this)
    modprobe tun > /dev/null 2>&1
    if ! cat /proc/misc 2>/dev/null | grep tun > /dev/null
    then
      fail_msg
      return 1
    fi


I don't have tun compiled on this Kernel.
Can this be the cause to have this fail? (returning 1 will cause
postinst to fail, right?)

>  A not mountes /proc for instance would suffice to get this result.

proc on /proc type proc (rw,noexec,nosuid,nodev)

Best regards,
Nelson