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I have tried CentOS 6.4 x86_64 (installation on my PC is very exhausting), it works! FYI
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Just so that anyone trying to install on Ubuntu may know.
As a production machine, the one where kernels are compiled, synthesized and P&R, Ubuntu fits just fine. In fact, we've been running a Ubuntu workstation for a while now with the Altera AOCL 13.0sp1 and it works just fine.
However, if you are looking for a machine where you can install the FPGA board and download an OpenCL bitstream, then CentOS 6.4 x86_64 is right for you. It just works (almost) out-of-the-box.
Sorry about not mentioning this before.