Diodon is a lightweight clipboard manager software which is well integrated with Ubuntu Unity and Gnome Desktop.
It features include a panel indicator, Unity Scope allows searching history, clipboard sync and a zeitgeist integration for an infinite clipboard history.
Diodon also supports images and plugins and it does just what a clipboard manager should do. If you would like more features (e.g. edit history), try CopyQ.
Install Latest Diodon in Ubuntu:
Diodon is available in Ubuntu Software Center since 13.10 Saucy, but Canonical does not provide future updates for this app.
The developer provides a stable PPA that contains the latest builds for this software and allows to receive future updates through Software Updater. So far, Ubuntu 14.04 LTS and Ubuntu 14.10 are supported.
To add the PPA, open terminal from the Dash or by pressing Ctrl+Alt+T on keyboard. When it opens, run:
sudo add-apt-repository ppa:diodon-team/stable
After that, you can upgrade Diodon through Software Updater. Or install the app for the first time by running below 2 commands one by one:
sudo apt-get update sudo apt-get install diodon unity-scope-diodon
Diodon clipboard manager starts working at next log-in.