i can't find 'tex.fmt'

[Lele]

Hi, i'm an italian student and i am really newbie of tex.
Every time i try to run latex or tex have a .dvi i have
:" This is Tex, Version 3.14159 (Web2C 7.2)
   I can't find the format file 'tex.fmt'!"
I run a Dbian 2.1 with the following packages installed :
tetex-base
tetex-bin
tetex-extra
tetex-nonfree
Could anyone help me, please ?
P.S Don't send the reply in m.l. since i'm not subscribed.

Thanks 
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