R help - Jul 2009 - what to do about "face 1 at size 16 could not be loaded"

Hi,

on some machines (all Linux, same behaviour with versions 2.9.0 and 2.9.1)
I get errors
> plot(E2)
Error in text.default(x, y, txt, cex = cex, font = font) :
  X11 font -adobe-helvetica-%s-%s-*-*-%d-*-*-*-*-*-*-*, face 1 at size 16 could
not be loaded

(but not on others; the R-installation is always the same (from sources), while
the Linux-distribution
should also be similar; the above failure occurs for Suse 11.0).

What to do about such errors?

Is it possible to tell R to ignore such errors (likely this is only about
some text, but by using options like "ann=F" I didn't succeed to
get it
working; E2 above by the way is a data frame)?

Or could I make a complete installation of R, which includes all the fonts etc.
R expects to find? (Apparently there is no standard what fonts should be there,
and so failures in this area are to be expected, or?)

Thanks for your consideration.

Oliver