This seems to be a very common problem with Ubuntu 14.
Upon looking around, I have something that might help.
First off, is the command
gsettings set org.gnome.settings-daemon.plugins.cursor active false
This seems to be the command that will restore the cursor, however, it is quite long and difficult to memorize. Now lets make a "short-cut"!
Bash: Linux's Swiss Army Knife
So lets make a quick bash script that will get you running quickly this problem arises. Type gsettings set org.gnome.settings-daemon.plugins.cursor active false
in a new file in your "Home" folder. name the file something like c.sh
or another name that is easy to remember.
Now we just have to set the executable bit for it. Open a terminal, (I am assuming the file isc.sh
and is in your "Home" folder) and type chmod +x c.sh
This will allow the system to run the file.
Now next time this happens just use the keybard short-cut, Alt+F2
to open an execute window, and type ~/c.sh
This will hopefully be a quick easy fix for this problem.
Note, however, there seem to be many things that cause this problem, so this answer may or may not work for you. Let me know if this works.
Hope this Helps!