On Fri, 5 Dec 2014, Felix Miata wrote:

>midi-pascal composed on 2014-12-05 12:23 (UTC-0500):
>
>> I use Trinity 3.13.2 on Ubuntu 12.04 LTS. As far as I can recall
>> (years), my TDE session started on vt7 (Ctrl-Alt-F7).
>
>Are you sure you even checked since long ago until now? My *buntu login
>managers have been running on vt8 at least as far back as 14.04.

Further back than that!
Here Ubuntu 10.04 and Trinity 3.5.13.2
(Like Uwe Brauer says: "because it works[")

 |jonesy@nix4:~$ ps -ef | grep X
 |root      1115  1015  1 14:51 tty8     00:00:03 /usr/bin/X -br
        -nolisten tcp :0 vt8 -auth /var/run/xauth/A:0-oLU9Ua

Jonesy
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