You all know the shortcuts <Ctrl>+c, <Ctrl>+v and <Ctrl>+x to copy and paste content from the clipboard. If not you should change that immediately. A great disadvantage of the standard clipboard is, if you want copy different text passages you have to change between the source and the target back and forth. Parcellite creates an history of the clipboard for you.
Download the package, install via the GDebi installer and add it to your autostart list.
A mouse klick on the applet or the shortcut <Ctrl>+<Alt>+h Parcellite shows you the last 25 clipboard entries and you can choose one.
You can paste this entry as usual via <Ctrl>+v. A typical use case would be, if you want to use a certain text passage several times, but want to work as usual without switching back to the original source all the time. It needs some time to use Parcellite effectively. Discover the opportunities and rock Ubuntu today.