I receive this error when I install the software.
Basically I want to know which space am I working on.
$sudo apt-get install indicator-workspaces
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package indicator-workspaces is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'indicator-workspaces' has no installation candidate
As far as I know, indicator-workspaces isn't necessary anymore, in 13.04, because the standard workspace switcher icon shows which workspace you're in, however, you have to enable the workspace switcher in the first place.
for ubuntu 13.04 go to this link indicator-workspaces download
open the ubuntu software center search for python-wnck , installed the library or use the following command
install the downloaded deb file
start the indicator-workspaces
for other options left click on the indicator panel
I have tested in the ubuntu 13.04 and its working
As answer is already given by other users , I am posting this to let other users know that I have tested indicator-workspace on 14.04 LTS and 15.04 and its working fine.