I created a live USB of my system using systemback before trying to upgrade from 19.10 to 20.04. My live USB backup works fine. I tried a Fedora 31 live USB and it works fine. I also used different methods to create the 20.04 Live USB thinking it might have been a corrupt iso. I tested the last live USB on my other Samsung Notebook 9 Pro 13" (different hardware) and it works fine. Both systems are dual-boot (Win10/Linux).
Reviewing the system log as it attempts to load, I believe the issue is with the discrete graphics chip in the CPU. There is a VGA error related to the AMDGPU. drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1878726 Title: Live USB Installer not working Samsung Notebook 9 Pro 15" Status in linux package in Ubuntu: Confirmed Bug description: Live USB made from ubuntu-20.04-desktop-amd64 fails to boot. System hangs with watchdog: BUG: soft lockup - CPU# and rcu: INFO: rcu_sched self-detected stall on CPU. System specs: Intel(R) i7-7500U running AMD discrete graphics Have tested the Live USB on other systems with no problems, appears to be hardware related with the Samsung Notebook 9 Pro and other systems (Dell, etc.) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1878726/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
