Blender 3d will not launch in fedora 26

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No need for more info. With Mesa 17.1 your GPU's OpenGL support was downgraded because "it was slowing down Chrome"... It seems to me that it wasn't the best move, it's Chrome that should have adjusted and blacklisted hardware acceleration on some GPUs, instead of breaking other apps.

Try running blender like that: fragment_shader=true stub_occlusion_query=true blender. You can also append undermentioned code after <driconf> in /etc/drirc and/or ~/.drirc to always run blender with OpenGL 2.1:

    <device driver="i915">
        <application name="Blender" executable="blender">
            <option name="fragment_shader" value="true" />
            <option name="stub_occlusion_query" value="true" />
        </application>
    </device>

You can also use the same approach on other apps, or better yet, buy some cheap, used Radeon GPU which will work out of the box and offer much better performance.