Download: http://www.xmind.net/download/linux/
sudo dpkg -i xmind...deb
sudo apt-get install -f
Thanks to dominique
via http://xmind.desk.com/customer/portal/questions/3814153-xmind-on-ubuntu-13-1-
sudo nano /usr/share/applications/xmind.desktop
replace line
Exec=/usr/local/xmind/XMind
with
Exec=env UBUNTU_MENUPROXY= /usr/local/xmind/XMind