Same thing here.
I successfully managed to have Android work using PhoenixCard burning software (http://www.cnx-software.com/2015/01/06/easily-create-an-androidlinux-bootable-sd-card-for-allwinner-a80-devices-with-phoenixcard-tool/). However, I cannot make ubuntu work, nor Raspbian Lite. I also tried Avafinger job, but it didn't worked as well.
I'm going to try Raspbian full and hope this will work, as I purchased a Banana pi to make it work on Linux.
I purchased a UART USB module to try debugging the ubuntu image, I hope I'll see something meaningfull.
Do someone know a link to a working Linux image?