James007, I was already enabled IU :).
Rafeek, nice, my problem came from I didn't have installed ncompress. I though that when I read the error message but I didn't know what bin IU had need to uncompress signature file. But now, I have another message :
./20141210-002-unix.sh
Validating available tools...
Decoding Intelligent Updater package...
Decompressing package contents...
cat: write error: No space left on device
Checking distribution integrity...
ERROR: This copy of the Intelligent Updater software package is damaged.
Recommend you download a new copy and try-again. Remember to
only use binary data capable transports. Also, verify that
your system is not low on disk space or memory.
A transcript of this installation has been saved as /var/log/iu-install.log
Do you know what space it need ? I have 3.8G space left ...
Thanks in advance.
Wagab