Due to the existence of an OpenDocument > PDF converter (unoconv -f pdf -- stdout $$i > $$o), the ps2pdf route fails for me in trunk. LyX tries to go the route via odt instead of the preferred latex > dvi > ps > pdf route.
Since we cannot yet prevent that (AFAICS), I opt for removing this converter, since ps2pdf strikes me like a pretty important output format still. Georg, this addition is yours: http://www.lyx.org/trac/changeset/4d62be3568d4ee998ff517e3877747c06bdf0622/lyxgit/ What do you think? Jürgen