1) Install gconf-editor (sudo apt-get install gconf-editor).
2) Press ALT+F2 and type gconf-editor.
3) Navigate to /apps/docky-2 - note that Docky should not be running (or it may override your changes) and that any changes made require a restart of Docky.
4) navigate to /apps/docky-2/Docky/Interface/DockPreferences/Dockn
5) go to -> Launchers
6) add the comma-separated path: file:////usr/share/applications/google-chrome.desktop
7) close gconf-editor and restart docky. 
If it doesn‘t show up, you maybe have to create the /usr/share/applications/google-chrome.desktop file as root. Check if you actually have it: cat /usr/share/applications/google-chrome.desktop
9) If not, you can use Iceweasel‘s desktop file and modify the path and save it to google-chrome.desktop
【Linux学习之旅】之Ubuntu14.04 Docky无法锁定Chrome解决之道,布布扣,bubuko.com
【Linux学习之旅】之Ubuntu14.04 Docky无法锁定Chrome解决之道
原文：http://www.cnblogs.com/xmont/p/3887078.html