startx , the command not found

[Khanh Cao Van <cvkhanh@gmail.com>]

I've install debian 3.1 and then use apt to install gnome and
xserverfreex86 . Everything seem to be ok since the system guide me to
config manything such as graphic card , resolusion etc . But when I
type startx , nothing happend except the error the command not found .

How could I do ?
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Cao Van Khanh