For those joining my addiction to the great Lotus Notes for their productivity here the way I made it work on Linux Mint 17 64bit:      (I use Notes Version 9.01)  IBM doesn’t offer Lotus Notes packages for Ubuntu 64bit. By modifying the 32bit package it’s possible to install it anyway.

Many thanks for the following tutorials, which I needed to alter / intermingle a little:

http://www.serenux.com/2014/03/howto-install-the-ibm-notes-9-0-client-on-ubuntu-64-bit/
http://days.myners.net/
http://kayadigital.wordpress.com/2013/05/03/lotus-notes-social-9-on-ubuntu-13-04/
http://insane-on-linux.blogspot.de/2014/04/installing-lotus-notes-9-on-ubuntu-1404.html
http://wiki.phoenixviewer.com/32-bit_firestorm_in_64-bit_ubuntu
http://jakobniggel.de/install-lotus-notes-9-on-ubuntu-12-04-64bit/

And here is the manual:

Install Lotus Notes 9 on Ubuntu > 12.04 64bit

1) Install in the Synaptic software a new repository:
insert this line in the box "deb http://archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse"
Then reload the repositories.

Then reload the repositories. Close Synaptic.

Type in terminal “sudo apt-get update”
Type in terminal “sudo apt-get install ia32-libs”

After that install the remaining i386 libraries

$ sudo apt-get update; sudo apt-get install ia32-libs libgnomeprint2.2-0:i386 libgnomeprintui2.2-0:i386 libbonobo2-0:i386 libbonoboui2-0:i386 libgconf2-4:i386 libgnome-desktop-2-17:i386 libgnomevfs2-bin:i386 libgnomeui-0:i386 libjpeg62:i386 libpam0g:i386 libxkbfile1:i386 ttf-xfree86-nonfree t1-xfree86-nonfree -y


2) Extract the Notes package

dpkg -x ibm-notes-9.0.1.i586.deb notes/
dpkg --control ibm-notes-9.0.1.i586.deb notes/DEBIAN

3) Change “Pre-Depends” and “Depends” in the following subdirectory/file:  notes/DEBIAN/control to:

Pre-Depends: libgnomeprint2.2-0, libgnomeprintui2.2-0
Depends: libart-2.0-2, libasound2, libatk1.0-0, libbonobo2-0, libbonoboui2-0, libc6, libcupsys2, libfontconfig1, libfreetype6, libgcc1, libgconf2-4, libgtk2.0-0, libglib2.0-0, libgnome2-0, libgnomecanvas2-0, libgnomeui-0, libgnomevfs2-0, libglib2.0-0, libice6, libjpeg62, liborbit2, libpam0g, libpango1.0-0, libpng12-0, libpopt0, libsm6, libstdc++6, libx11-6, libxcursor1, libxext6, libxft2, libxi6, libxkbfile1, libxml2, libxp6, libxrender1, libxss1, libxt6, libxtst6, libz1

3) Build the new deb package

dpkg-deb -b notes

4) Install the package

dpkg -i notes.deb
dpkg -i ibm-feedreader-9.0.1.i586.deb
dpkg -i ibm-activities-9.0.1.i586.deb
dpkg -i ibm-sametime-9.0.1.i586.deb
dpkg -i ibm-opensocial-9.0.1.i586.deb

(the package dpkg -i ibm-cae-9.0.1.i586.deb is not part of the 9.01 version).

Good luck!