Thank you for your help. I solved the problem in a stupidly easy way, or rather discovered that I had caused the problem in a stupid way. It struck me as strange that I could launch Denemo but not Lilypond, and it occured to me that when I installed Denemo from the add/remove software tab on the preferences pane I might have installed a version of Lilypond that was conflicting with the one I had downloaded separately. So I deleted both programs and started over, installing both of them from the add/remove software tab on the preferences pane.. Now Denemo runs, and Lilypad runs also. It should have occurred to me that if the repository maintainers included Denemo that they would have made sure that the Lilypad they had was compatible with it.
-- Sent from: http://lilypond.1069038.n5.nabble.com/User-f3.html
