I am having a new Dell Inspiron 5567 laptop (with : Intel Core i7 7500U /8 GB RAM /256 GB ssd/ AMD R7 M445 4 GB as independent Graphics card and an Intel 620 card on board). I installed Ubuntu 18.04 and could only "see" the intel card so I searched for drivers here https://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-for-Linux-Release-Notes.aspx and I followed those instructions https://support.amd.com/en-us/kb-articles/Pages/Installation-Instructions-for-amdgpu-Graphics-Stacks.aspx. As a result, when I installed those drivers Ubuntu crashed after reboot, I couldn't login even in recovery mode. I reinstalled Ubuntu, I tried one more time and the some problems. Can you please give me a solution?