If you have the FLEXM folder then, copy that folder onto Cadence installation directory, then change the alias and indicate it to FLEXM/license.dat... change the hostname in license.dat.
Also run this command,
sudo mkdir /usr/tmp
sudo chown abhierao/usr/tmp
sudo chmod 755 /usr/tmp
I have successfully installed IC615 on UBUNTU 14.04 32bitDo not remove USE_SERVER line its a big mistake