Change ownership of the configuration folders - /etc/lotus:.Let's assume you're not going to do that! Note that this may cause problems if you're trying to use notes for multiple users on the same host.
You'll be asked to accept the license and specify an installation folder (/opt/ibm/lotus/notes). This should launch the graphical InstallShield wizard. This is usually available from your Notes administrator, or as part of the Notes/Domino package.
Note that a lot of server administration can be done using a web administration interface included with the Domino server. So Linux users can use the Domino server and Notes clients for mail and applications, but server administration and application design needs to be done using Windows. Note that while the client is supported for Ubuntu, the server installation requires a little googling/tweaking to succeed. The client, Lotus Notes, and the server, Lotus Domino, are available. Note that the Administration Client and Domino Designer client are only available for Windows. Evaluation downloads including all supported platforms are available here: Evaluate: Lotus Notes and Domino Administrator clients. It provides instructions for all the OS's IBM supports for Notes.
In the mean time, the best installation/configuration/removal instructions is through IBM's Notes Client Installation and Upgrade document. Installing Lotus Notes Client in ubuntu.Lotus Notes 6.5.2 on Breezy Badger using Wine.IBM Documentation on Lotus Notes installations.