Dear Elmar,Thank you for your tips. But before reinstalling from scratch on my desktop, that is a lot of work, I will reinstall Debian on an old netbook which is on a desk and I don't use anymore. I'll run debchekroot on it and we will see...
I must apology if my English is not very good. I'm french and I do really have problems learning over languages. So sorry if I'm not very clear and if I use words in an unusual way...
Best regards, Sylvain
