Install Cairo Dock 3.2.1 in Ubuntu

Install Cairo Dock 3.2.1 in Ubuntu 13.04 Raring/Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/11.10 Oneiric/11.04 Natty/10.10 Maverick/10.04 Lucid/Linux Mint (New Release)

Cairo-Dock, a fast and customizable desktop interface which can be used as alternative or addition to Unity, Gnome-Shell, Xfce-panel, and KDE-panel, is now at version 3.2.1.
Cairo-Dock sits in the centre of your desktop, allowing you to monitor and control your favourite apps: music players, chat messengers, twitter, torrents downloaders, RSS feeds, calendar/tasks, weather, mail checkers, etc, and a powerful taskbar.

Cairo Dock includes many plugins/applets such as: weather, clock, Messaging Menu, system monitor, keyboard indicators, custom icons, notification area, clipboard manager, and many other plugins.

What's New in Cairo Dock 3.2?
Main Changes:

• Multi-screen support has been improved;
• A couple of new applets have been added, Screenshot and Indicator-Generic;
• A new plugin called Sound-Effects has been added;
• Gnome-Shell support has been integrated in this release;
• GDM support has been added for user switching;
• Systemd support has been added for the session management;
• Support for all the Unity indicators has been implemented;
• Countless bug-fixes and improvements have been added.

Core:

• Dialogues:
• Fixed a small bug with the default icon
• Force to take the focus when the dialogue has a user widget, since some WM prevent focus steal
• Gnome-Shell: the dash was hidden all the time
• GUI:
• Docks list: only list main docks and subdocks and not launchers and applications with subdocks (when there are windows with the same class and if these icons are regrouped into a subdock)
• Menu and GUI: Move to another dock: if it's a container: Do not add subdocks that are contained in this container (to avoid loop: subdock1->subdock2->subdock1)
• Simple: Plugins: 'Help' applet was not listed
• Simple: Config: force to display the config widget (the config panel was empty with some older versions of GTK)
• Help applet: This applet didn't have any preview icon file
• Icon:
• Label: If we don't want to show label, keep info about the font: it can be used by other applets (e.g. Clock)
• Windows thumbnails: fixed a small bug that made the thumbnail unavailable the first time the window is minimized
• Init & Themes:
• Deactivate the option 'Show Windows Thumbnail' in the current theme.
• This option can provoke annoying bugs with other applications the desktop (e.g. Gedit or Nautilus displayed corrupted icons when using a smooth scroll)
• It seems this bug is due to the video drivers and it's fixed with the latest stable version of these drivers (but which is not available with most distributions)
• Note: It's still possible to re-enable this option from the config panel
• Taskbar: Fixed a possible crash in a convoluted scenario (if there are a few untitled windows with the same empty class)
• X11: Fixed a crash when using Xinerama with multi-monitors
• Translations: Imported translations files from Launchpad: thanks to all contributors

Plug-ins:

• DBus:
• Python interface: Translations: avoid blank dialogues when using special characters from .mo files with Python2.
• Force the height of the menu, since GTK doesn't update it correctly
• GMenu: Preload icons at startup: removed this option: it's no longer needed when using libgnome-menu-3 and it can slow down the creation of this menu
• Indicator-Generic:
• If no indicator found, stay in the plugin mode to not create an useless icon
• New indicators was not automatically launched: Monitor the indicator3 dir in order to reload indicators when these files are modified/added/removed
• Do not insert or detach icons if it's not necessary
• Translations: Imported translations files from Launchpad

Other Changes:

• Deluge: A menu entry to quit the application was missing
• Gmail:
• Make base64 work with python3
• Handle messages with no subject
• Updated the config file and removed an unused option
• Pidgin/Xchat: fixed a wrong option type ('animation type' is an integer)
• Screensaver Inhibitor: FreeDesktop: support both newer and older object path
• Transmission:
• A menu entry to quit the application was missing
• urllib requires UTF-8 in python3

To Install Cairo Dock in Ubuntu/Linux Mint (Press Ctrl+Alt+T) and copy the following commands in the Terminal: 

• sudo add-apt-repository ppa:cairo-dock-team/ppa
• sudo apt-get update
• sudo apt-get install cairo-dock cairo-dock-plug-ins

That's it 

Source: glx-dock.org