More articles and info about Ubuntu Touch (Phone & Tablet OS) :

- Ubuntu Touch Developer Preview - Porting Guide : shows that Android/CyanogenMod is used :
"For quick reference, these are the current components used from Android:
- Linux Kernel (stock Android kernel provided by the vendor, with a few changes to support some extra features needed by Ubuntu);
- OpenGL ES2.0 HAL and drivers;
- Audio/Media HAL and services, to re-use the hardware video decoders;
- RILD for modem support;
As Ubuntu is running in a separated container on top of an Android kernel and services, the communication between them happens via Binder, Sockets and libhybris."
So Ubuntu is run in chroot;

- "Benchmarking The Google Nexus With Ubuntu" from Phoronix : "With Ubuntu Touch using Google's SurfaceFlinger and not using an X11/X.Org Server (or Wayland), the usual Ubuntu graphics benchmarks won't work."

- "My Favorite Command For Ubuntu Touch/Tablet" from Phoronix : shows how to enter Ubuntu shell using "ubuntu_chroot shell" from adb or ssh. The repositories are "http://ports.ubuntu.com quantal/*" with many thousands packages;