SOLVED BY MYSELF
I give the explanations to the other beginners :
I typed the following lines while I was connected to the web
""If you have a program that does not work, then type first like this :
1. sudo apt-get remove [program_that_does_not_work]
""and type lines 2 to 5 (look under) to clean your system
**else begin directly at line 2 till 5
2. sudo apt-get clean
3. sudo apt-get update
4. sudo dpkg --configure -a
5 sudo apt-get upgrade
Nice !
NB : Caution : "gnome" programs do not work under KDE. Then avoid to download
them. else the OS becomes unstable.
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(Ku GUPSY) troubles with Update Installer
https://bugs.launchpad.net/bugs/213857
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