The web app is actually completely missing and the server welcome/index page
says lemonade was built without a desktop app.

Trying to open URL http://localhost:13305/lemonade (or running the desktop app)
returns a JSON error "The requested endpoint does not exist".

It seems Ubuntu actually ships the app with lemonade-server 10.2.0-0ubuntu2 and
Deb's change log says it was added in 9.3.0-1.

Perhaps it stopped being built in 10.3.0-1?

  * Use new upstream build system for nodejs
  * d/rules: don't allow downloading executable binaries

Or in 10.5.1-1?

  * d/install: drop lemonade-server

I guess the app should be correctly built and packaged or this package should
stop being built at all.

Have a nice day