Additional Workspaces

Solution 1:

9 workspaces for you

gsettings set org.compiz.core:/org/compiz/profiles/unity/plugins/core/ vsize 3
gsettings set org.compiz.core:/org/compiz/profiles/unity/plugins/core/ hsize 3

:)

Solution 2:

Unity Tweak Tool will let you go up to 6 workspaces easily.

Just go to Workspace Settings under window Manager here you can set how many horizontal and vertical workspaces you want in the grid.

Solution 3:

I will assume by WORKSPACES you mean "virtual desktops"

You can easily set these in CompizConfig

sudo apt-get install compizconfig-settings-manager

Then

ccsm

Navigate to "General Options"

Select Desktop Size. Boom!