I wanted to upgrade Upstart on Ubuntu 10.04 to make use of the new user jobs feature. I cherry picked packages from Ubuntu 11.10 via http://pkgs.org/ubuntu-11.10/ubuntu-main-amd64/ . Here's what I came up with: (Run each command separately, some require user input)
I found that dbus wasn't installed, and as such running start foo would fail:
$ start foo
start: Unable to connect to system bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
Fixed via sudo apt-get install dbus