Can't get helvetica font in LyX

[Glenn Hutchings]

Hi there!

Just installed the latest version of LyX, thinking it might 
fix my lack-of-Helvetica problems, but nope.  I can select 
Helvetica in the document layout menu, but it still appears 
as the default font (computer-modern) on output.  Is this a 
LyX problem, or is it TeX/LaTeX, or is it my system?  Anyone 
else have font problems like this? (BTW, all the other fonts 
work fine, and my system is Mandrake 7.2.)

Thanks in advance,

Glenn