Accidentally I found the solution.
The applet cannot set the weather because it needs root privilege.
Add your city as usual, and close the window. Next left click at the
clock, click at Locations and set as default your city. It will ask for
admin password, and you're ready...
--
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-panel in ubuntu.
https://bugs.launchpad.net/bugs/682269
Title:
clock applet does not support certain obvious locations
--
desktop-bugs mailing list
desktop-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/desktop-bugs