I have found some spare time to install the IBM Lotus Notes 8 client under Kubuntu 7.04.
The start menu in Kubuntu:
The "About Notes..." dialog box:
Nothing to see about Linux.
The installation itself was quite easy. I just followed the following blog entries:
Install Lotus Notes 8 Beta 3 on Ubuntu 7.04 Feisty Fawn - Step by Step and
Install Lotus Notes 8 GOLD on Ubuntu 7.04
Because I'm using Kubuntu instead of the Gnome based Ubuntu, I additionally had to install the packets libgnomeprint2.2-0 and libgnomeprintui2.2-0 together with their dependencies.