how to find installed 3rd party debs?

[Uwe Brauer]

>>>>> "Derek" == Derek Broughton <news at pointerstop.ca> writes:

   > Wulfy wrote:

   > # apt-cache madison `aptitude search '~i !~M' | tr -s ' ' | cut -f 2 -d ' '`

Thanks but I obtain a odd result:

 amarok | 2:1.4.5-0ubuntu2~edgy1kubuntu1 | http://archive.czessi.net edgy/main Packages
    amarok | 2:1.4.4-0ubuntu1 | http://kubuntu.org edgy/main Packages
amarok-xine | 2:1.4.5-0ubuntu2~edgy1kubuntu1 | http://archive.czessi.net edgy/main Package
s
amarok-xine | 2:1.4.4-0ubuntu1 | http://kubuntu.org edgy/main Packages
   digikam | 2:0.9.1-0kubuntu2 | http://archive.czessi.net edgy/universe Packages
dvd+rw-tools | 7.0-6~edgy1 | http://archive.czessi.net edgy/main Packages
       hal | 0.5.7.1-0ubuntu13linux2go1 | http://www.linux2go.dk edgy/main Packages
       k3b | 1.0-0ubuntu2kubuntu1~edgy1 | http://archive.czessi.net edgy/main Packages
  kaffeine | 0.8.4-0kubuntu1~edgy1 | http://archive.czessi.net edgy/main Packages
kaffeine-xine | 0.8.4-0kubuntu1~edgy1 | http://archive.czessi.net edgy/main Packages
kipi-plugins | 0.1.3-0kubuntu1 | http://archive.czessi.net edgy/universe Packages
koffice-data | 1:1.6.2-0ubuntu1~edgy1 | http://kubuntu.org edgy/main Packages
koffice-libs | 1:1.6.2-0ubuntu1~edgy1 | http://kubuntu.org edgy/main Packages
     krita | 1:1.6.2-0ubuntu1~edgy1 | http://kubuntu.org edgy/main Packages
krita-data | 1:1.6.2-0ubuntu1~edgy1 | http://kubuntu.org edgy/main Packages
   kspread | 1:1.6.2-0ubuntu1~edgy1 | http://kubuntu.org edgy/main Packages
  ktorrent | 2.1-0kubuntu1 | http://archive.czessi.net edgy/main Packages
etc

Some of the debs seems not to be official, but some like
http://kubuntu.org edgy/main Packages should be....

So what is wrong here?

Uwe Brauer