I'm using a second hard drive to hold most of my data files. Links to files and folders on the second drive from all locations on my first drive, where Ubuntu 14.04 is installed, work, except that after a reboot links on the desktop are broken. Links in my Home folder remain valid, which is strange since the Desktop is a sub-folder of my Home folder. I mount the second drive in the Startup Applications app.
This is different behaviour from 13.10 (and older releases) where the Desktop links persisted after reboots.
I think its mount problem if you have to mount the second hard drive at each restart it, the symbolic links will surely be broken to avoid that simply edit
add mount command to the second hard drive to it.
if problem persists add the symbolic link commands in the file also so it would be created at each restart.