Quartus Prime 15.1 standard tool unable to recognize the license

I have generated a valid license with new companion ID for Quartus Prime 15.1 standard. I provided license file in license setup window by browsing and selecting the .dat file on my system and also tried "use LM_LICENSE_FILE variable" option. But in both the cases the tool unable to recognize license file. Am I missing something in getting the tool up with license?

Technical details:

OS : Ubuntu 16.04 LTS

Tool : Quartus Prime 15.1 Standard

License type : Fix Type

Line added in bashrc file :

export LM_LICENSE_FILE=/path/to/file/as/in/PWD