Altera-Modelsim starter edition software on ubuntu 12.10 License issue

Hi,

Q#1

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I just installed Altera-Modelsim starter edition software on ubuntu 12.10 , which is available for download on Altera website. The software platform I am running is ubuntu 12.10. It got installed successfully but I cant launch it. When I go to the "bin" directory in the installation and I launch "./vsim" to run the simulator , I get error related to license. Below is the error.

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xohaib@zee:~/Downloads/12.1_177_modelsim_ase_linux/linux_installer/modelsim/INSTALL/bin$ ./vsim

Unable to find the license file. It appears that your license file environment variable (e.g., LM_LICENSE_FILE) is not set correctly.

Unable to checkout a license. Vsim is closing.

** Fatal: Invalid license environment. Application closing.

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Please help me how to deal with it , as download page says that Modelsim-Altera starter edition does not require a license.

Q#2

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my second question is related to the difference between Altera-Modelsim and Modelsim PE-student Edition available on Mentor's website. They do not have a download for Linux , but what are the differences between both. Is not it the same product?

Thank you very much,

zohaib