Sébastien Garrigues wrote:
I put the layout in my home directory : home/.lyx/layouts/
after reconfiguring lyx, and restarting it no new class of document appear !!
Don't copy it to the .lyx folder, copy it to the LyX installation folder ~/lyx/share/lyx/layouts
and reconfigure LyX again.
(Assure also that the corresponding LaTeX class is correctly installed in the LaTeX distribution.)
regards Uwe