ot: i hav a "ghost-user"

[Lutz Kaiser]

 		Hi all,

i use debian and Linux from the beginning of this year, so i'm realy new 
to linux.
But here ist my problem:
Everytime i strat the computer, login, i have 2 users, also i'm of curse 
just logged in with one on tty1.

The - let me call it Ghost-user is allways from April the 23th,

Any hints, ideas are very welcome!!!
Many thanks in advance!
Now my steps i've made.....
lutz at spirit:~$ who
lutz     tty1         May  9 22:17
lutz     pts/6        Apr 23 00:35 (:tty2:S.3)
lutz at spirit:~$ uptime
  22:31:37 up 19 min,  2 users,  load average: 0.00, 0.00, 0.02
lutz at spirit:~$ ps aux | grep lutz
lutz      3792  0.0  1.4   6012  2852 tty1     Ss   22:13   0:00 -bash
lutz      3927  0.0  0.4   4616   896 tty1     R+   22:32   0:00 ps aux
lutz      3928  0.0  0.2   3680   428 tty1     R+   22:32   0:00 grep lutz