On 7th jan 2014 the first update to the Ubuntu dual boot installer for touch devices was released. The mail sent by the Canoical team says that this is the first update since Ubuntu and Android dual boot developer preview was announced in Dec 23rd 2013. Ubuntu Dual Boot Installer is provided as a tech preview for developers who want to run Ubuntu and Android on a single device.Canonical also has still kept the warning that it is not for regular users as its not a fully stable version. You have to remember that the Ubuntu Dual Boot Installer is still in development and you might experience problems.
Here is a complete download and tutorial from the ubuntu wiki : https://wiki.ubuntu.com/Touch/DualBootInstallation
This version however was extensively tested on the Nexux 4 and yet to be tested on Nexux 10. According to the changelog, a warning for unsupported devices is now shown, Ubuntudualboot app is now installed in Ubuntu, and the Install/Download progress bar now fits the screen size in Nexus 10.
Also, Ubuntuinstaller now supports resume for downloading images, and the Ubuntu Installer Application now displays channel chooser on CM 10.2.