Ubuntu is currently unsupported because all recent versions lack at least one important package (python-xpcom).
In order to install sugar-jhbuild, you need git-core and subversion.
After installing and updating sugar-jhbuild according to the common instructions, you can use this invocation to install all dependencies automatically:
./sugar-jhbuild depscheck -s | sudo xargs aptitude -y install
- broken D-Bus security configuration that prevents sugar-emulator from working (because Xephyr cannot work).
- sugar-emulator doesn't work properly if the X server uses evdev as keyboard driver (because of a Xephyr bug).
- python-xpcom missing (and thus Browse cannot work)
- gtk-recordmydesktop may prevent sugar-emulator from working properly