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Check the AMD Radeon Software for Linux latest version that is available. This is because until these graphics drivers support a linux kernel version there is no use trying to install linux in your machine.
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Check the kernel version supported and create a bootable drive of the linux distro with exactly that kernel.
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While installation DONOT agree 'download updates while installation'. Random updates are installed which can be a problem.
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After installing there is a high chance that the neither(internal gpu nor dedicated GPU) drivers are installed. If the linux doesnt boot under GUI, try TTY
(ctrl+alt+F[1-6])
and change the following parameter in /etc/default/grubGRUB_CMDLINE_LINUX_DEFAULT = "nomodeset"