[fChk]

I have Debian 9 x64, these commands giving E: unable to locate error. please guide me step by step

Why I'm not surprised ? :-)

Okay!.. A couple of checks here:

1- Does glxinfo command exist on your system ?
> How do you know that? Well just run this:

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which glxinfo

If it's installed you'll have the path of its binary.

> + If answer is yes > go to 2.
 + If answer is NO! > then install the mesa-utils package (for debian-based systems):

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sudo apt-get install mesa-utils

2- I hope you're not trying this on VPS-9!.. because it doesn't have a display unless you've explicitly created one with xvfb for example. In which point I don't see the point of looking for the GPU!.

> + If answer is yes : you have to give more details on what are you trying to do.
+ If answer is no and you're doing this on a GPU-backed system with its display and all that, then go to 3.

3- If you get to point 3 and still can't figure out your problem then you're on your own!..

Good luck!