(Replace HD with the name by which the external drive was mounted replace FILENAME with the filename you wish to use for the resulting image (or set another path as desired).).

Open a terminal and run the following: dd if=/dev/mmcblk0 of=/media/ubuntu/HD/FILENAME bs=1M.

Right-click on the OS and Recovery icons in the Unity launcher and choose Unmount for each.

Plug in a USB external hard disk with at least 32GB of free space.

Optional but highly recommended: Make a backup of the complete SSHD image

When grub menu loads, select Try Ubuntu.

In Windows, hold Shift key and click on Restart choose Advanced Options/UEFI Firmware to enter BIOS.Insert memory stick in Asus EEE USB port.Alternately, instructions for generating this file can be found here on github - look for JF Well's site on the t100.Fetch bootia32.efi from github (?) or from one of the links listed at the end of this post.After the memory stick is set up, copy bootia32.efi to the /EFI/BOOT directory on the memory stick.In Linux, sudo apt-get install unetbootin run unetbootin in a terminal window.Prepare Ubuntu Live bootable USB memory stick: scroll to the bottom of the screen and click to turn off BitLocker/decrypt drive.In Windows, click on PC Settings/PC and devices/PC info.In Windows, turn off BitLocker (this will allow Ubuntu to mount and/or resize the primary data drive): Note also that you do have to boot into Windows a time or two: Note that much of the same process could be followed to set it up for an Ubuntu-only installation. Here is how I set it up to dual-boot Ubuntu 14.10.

Additional steps needed to enable internal wifi and other needed settings are included below.

Instructions for installing 15.04 should be essentially the same as below, but I have not tried installing it from scratch, and cannot verify that all of the steps are the same (or even necessary). With the 4.1 kernels, there are some occasional problems with freezing. With 4.0 or later kernels, internal wifi now works and power management works in part (battery monitoring), but suspend, sound, and bluetooth still do not work. UPDATE: I am now running Ubuntu 15.04 on this machine, still dual-boot (though I haven't booted into Windows in months). Some things do not yet work - internal wifi/bluetooth, sound, power management - but with a usb wifi adapter, enough works, and works well enough, that I have used it as a travel machine - a role in which it excels. I have been running Ubuntu 14.10 in a dual-boot configuration on my Asus EeeX205T for a couple of months now.

Asus sonicmaster boot menu