ok I will try this evening
Another question, is it possible to uninstall libstdc++ package and install again ? When I did this :
apt-get remove libstdc++6
I get :
The following packages will be removed:
A lot of packages is list here
You are potentially do something harmful
To continue type "Yes, Do as I say!
Is it possible to uninstall in this way and then do
apt-get install libstdc++6
I feel that the libstdc++6 file is wrong
thank you again !