i just install ubuntu 18.04 and i cant install the amd proprietary driver because it's not compatible with linux kernel 4 or above. Now i want to install the open source driver, is it already installed or should i install it and how ? My graphic card is: Amd radeon hd 7640g + 7670m dual switchable graphics
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2Possible duplicate of Ubuntu 14.04.5/16.04 and newer on AMD graphics – dobey May 06 '18 at 19:15
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Open-Source drivers are already installed.
If you want to get the proprietary drivers working or would just like to possibly improve the performance of your card, check out this excellent tutorial.

Joshua Besneatte
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I've just installed KDE Neon (Ubuntu 18.04 based) and I can't see the 4K resolution option in the screen configuration. Should I follow this tutorial inasmuch as I have a AMD Raden HD 6850? – AMGMNPLK Jan 09 '20 at 09:39