It was the Ubuntu tex instalation.

>
>Horacio Suarez wrote:
> > hello all, generous people:
> >
> > I have in a file this:
> >
> >    \startitemize[a,packed]
> >
> >       \item uno
> >
> >       \item dos
> >
> >    \stopitemize
> >
> > If I compile it on windows, (ver 2007.08.29) itīs ok; but if I compile
> > it on linux ubuntu (context version: 2007.04.17) I get this ERROR:
> >
> > Missing = inserted for \ifnum
>
>This is likely to be a bug in the April 17 version of context. How
>did you install that version of context ?
>
>Best wishes,
>Taco
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