I recently installed Ubuntu 18.04 and there are so many problems with it (suspending issue, sound issue, graphic card issue, dual monitor issue, pcie error). I resolved suspending and sound issue, but I can never fix graphics card, dual monitor issue, and pcie error. For graphics card issue, 1. I tried simply choosing and downloading nvidia-390 driver in additional software - did not work 2. tried remove nvidia and reinstall by linux command below - did not work sudo apt --purge remove nvidia* sudo ubuntu-drivers autoinstall3. and I tried several other suggestions like blacklist-ing nouveau and install and other solutions. But none of them are working. *** prime-select query returns nvidia. But in settings-detail, intel one is being chosen. For dual monitor issue, when I connect the second display to the laptop, it simply either 1. get crashed (display gets broken) or 2. does not do anything. For pcie error, I tried adding the line in /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pci=nomsi"But did not fix the problem. Can someone please tell me how to fix these problems? Thank you.