FlexNet v11 requires LSB (Linux Standard Base) 3.0 or higher. Use the command lsb_release -a to check if LSB is installed. If not, install it using the packet manager for your Linux distribution. Make sure to install the correct 32 or 64-bit version of LSB. For example NORSAR-2D would need the 32-bit version and NORSAR-3D 64-bit would need the 64-bit version. You can have both 32 and 64-bit versions installed at the same time