1) Install Ansys 15 as usual via GUI installer
2) Install “lsb” package. For Design Modeler to work you had to download the following packages from Oneiric and extract the libraries (not install!) in
/yourinstallationpath/v150/commonfiles/MainWin/linx64/mw/lib-amd64_linux_optimized
libxext6
libxrender1
libxfixes3
3) Add new variable to your system
export LD_LIBRARY_PATH=/yourinstallationpath/v150/Framework/bin/Linux64/Mesa
export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libX11.so
4) Run Workbench via command
setarch x86_64 --uname-2.6 /yourinstallationpath/v150/Framework/bin/Linux64/runwb2 -oglmesa
Additional materials: