(from Ubuntu bug tracker at https://bugs.launchpad.net/ubuntu/+bug/1615204)

Detailed bug description:
In Linux kernel 4.4.0-34-generic on the Toshiba Chromebook 1, if you try to select text by word, by double-clicking/triple-touchpad-tapping and then dragging the mouse, this only works occasionally. However, selecting text by line with a triple-click/4-tap drag works fine.

Steps to reproduce:
1) On a 1st-generation Toshiba Chromebook (and possibly other machines, too), run Ubuntu 16.04.1 from a boot disk (http://releases.ubuntu.com/16.04/ubuntu-16.04.1-desktop-i386.iso).
2) Open a terminal window and type several words.
3) Double-click/triple-touchpad-tap and then drag the mouse to attempt to select multiple words.
4) Compare this to the same boot disk run in VirtualBox, where it works properly.
5) Also compare this to Ubuntu 14.04.5 with the hardware-specific update to Linux kernel 4.4.0-34-generic, where it doesn't work.

Expected results:
Multiple words are selected.

Actual result:
Only the first word is selected.

Reproducibility:
Double-click drag-select will work occasionally, but most of the time it doesn't.

Workaround:
In applications other than Terminal, can use Ctrl+Shift+Right-Arrow to select by word (significantly slower for large text blocks). No known workaround for Terminal.

Impact:
Recommend not upgrading to 16.04 if you have a computer where double-click drag-select doesn't work in it.

Description of the environment:
 Operation system: Ubuntu 16.04.1
 Versions of components: Linux kernel 4.4.0-34-generic (also on Ubuntu 14.04.5)
 Reference architecture: 1st-generation Toshiba Chromebook (model name "Toshiba Leon")
 Network model: N/A
 Related projects installed: none (boot disk)

Additional information:
N/A