Alan Bell, http://dominux.co.uk explained how to enable the installation of Notes 8 on Ubuntu.
Basically the installer requires bash rather than dash. To do this as Alan explained...
start a terminal session, and...
ls -l sh
this should show sh -> dash
sudo rm sh
sudo ln -s bash sh
ls -l sh
this should now show sh -> dash
Download the installer for Notes8 beta 2 for Linux from IBM and extract the archive by running...
tar -xvf notes8standard_linux_beta2_np.tar
Once this has been successfully completed you can run the Notes8beta installer by running ./setup.bin
From this point onwards the intsallation if basically the same as on the Windows platform.
After installation the client can be started by running ./notes from inside the clients directory.
I found that I had to exit the client and restart it to successfully get up and running.