First no extended screen, now my password doesn't match

[jb]

Hallo,
I'm new on this board and if I'm wrong here, sorry please, kindly drop 
me line.

_My entry._
I know Linux since the late 80ies but I did not work continously
work with it, because it was  mostly for me to difficult to handle.
You see I'm not a real Newby, but I got more and more sick of beeing
the administrator rather than an operator who wanted to work with Linux.

Another reason was that Linux - from Redhat over Suse and Debian to Ubuntu
- never provided a pleasant enviroment  for me  and especially for the 
applications
I wanted to run (Officeapps, Mediaapps). So far ....
Since I'm now in retirement I find that there is no more reason to hold
an expensive and extremly  by it's provider controlled OS  on my Computer
I decided to make another trial with Linux, Ubuntustudio 12.04, KDE

_My issue_
Hardware: Thinkpad ( Lenovo X61T )
OS:             Ubuntustudio 12.04 running with KDE installed on 
USB-stick, 32 GiB
                    with nearly 22 GiB free space) (no Live-Version)
Aim:           Running a second screen as an extended and not as a clone

First impression: easy to install, even the printer!!!! That was really 
new for me
                                and raised hopes.

But all my trials to run an extended screen got fail and were ending to 
a Clone and
after some investigations in the net and some queries  with the
Xserver and randr I couldn't solve my problem. I do not really remember 
whether
I changed a parameter, but when I started my Ubuntu next day, Ubuntu doesn't
rember  or accept my password.

Who can help me a) with the password lock and b) with the extended screen?

Regards
-- 
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