Hi @kaihengfeng, I am not familiar with kernel/git bisection and was unable to do what you asked, partly because I couldn't boot into linux/ubuntu to begin with, and updating the kernel from 19.10 wouldn't test all the other services that could be at play.
However, after repeated efforts or restarting my system, I was able to finally get the live USB to get past the blocker (still not sure why it was blocked from booting). I wish I could explain what steps I took in order to get to this stage, but it was truly a luck of multiple reboots switching between safe kernel and nor kernel, enabling and disabling secure-boot until the system corrected itself and booted from the liveUSB. From the successful session, I was able to install a clean version of 20.4 LTS, but have had the same issue when trying to reboot, that I was having with the live USB. Because I was able to finally boot into the Live USB without any system changes, my thought is the problem is not with the kernel (otherwise, I would have never have gotten it to boot, regardless of how many attempts through restart). It consistently seems to fail during a systemd initialization, with uuid, as if the UEFI partition is not found. Checking fstab, everything seems to be correct. Looking at the log files, unfortunately, they only reflect the successful boot. All of my previous failed attempts to boot in 20.04 aren't present. At this point, I am not sure how I can help to troubleshoot this issue, but it is still an issue to consistently be able to boot into 20.04, even though I was able to install from the live USB. Any recommendations on what to try, will be gladly appreciated. -- 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: Incomplete 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
