Hi Nicolas,
> Don't know where LD_PRELOAD is defined... (not in /etc/)
> Any solution?
I found it in 
/opt/kde3/bin/kgtk2-wrapper:
Line Number: 22
    LD_PRELOAD=/opt/kde3/lib/kgtk/libkgtk2.so:$LD_PRELOAD "$@"
Line Number: 31
        LD_PRELOAD=/opt/kde3/lib/kgtk/libkgtk2.so:$LD_PRELOAD $real "$@"

and

/opt/kde3/bin/kqt3-wrapper:
Line Number: 18
    LD_PRELOAD=/opt/kde3/lib/kgtk/libkqt3.so:$LD_PRELOAD "$@"
Line Number: 27
        LD_PRELOAD=/opt/kde3/lib/kgtk/libkqt3.so:$LD_PRELOAD $real "$@"

and
/var/lib/dpkg/available /var/lib/dpkg/available-old /var/lib/dpkg/status /var/lib/dpkg/status-old

an some more in /usr/bin and /usr/share, if that helps.
-- 
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Hartmut 

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