I finally succeed upgrading FOG
What I did :
mysqld return an error on line 103 so I Looked at mysqld : line 103 there was a # inside an IF (put by installfog.sh ?) :
if [ "$1" = "sos" ] ; then
# MYOPTIONS=“$MYOPTIONS --skip-grant-tables --skip-networking”
fi
To solve this i have deactivated these 3 lines