Had this on my A315 too, but I returned it to the vendor. Seems to be an UEFI-Bug, because it doesn't happened with my Ryzen 2500U from HP. Could also be related to that Ryzen/Radeon 535 combination (Vega/CGN 3).
On Grub-Menu press E and add "pci=noacpi" as kernel-parameter (where normally "quite splash" is). Then go on booting by pressing F10. Sometimes (XFCE) it was also necessary to add "nomodeset" to boot, Gnome for example didn't need it (AFAIK). I remember, I also needed to install amd's pro driver (for 18.04) via amdgpu-pro-install to get rid of the "nomodeset". I was able to run amdgpu-pro-uninstall later and still not needed the "nomodeset". Could be related to my system, but you may give it a try. I was also using Kernel 4.17 (Mainline), which is available on http://kernel.ubuntu.com/~kernel-ppa/mainline/ or with UKUU https://www.omgubuntu.co.uk/2017/02/ukuu-easy-way-to-install-mainline-kernel-ubuntu -- 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/1776563 Title: Ubuntu 18.04 can't load kernel on Acer Aspire A315 (Ryzen5/Radeon/FHD) Status in amd: New Status in linux package in Ubuntu: Confirmed Status in xserver-xorg-video-amdgpu package in Ubuntu: Confirmed Bug description: CPU: Ryzen 5 2500U VGA: Radeon 535 Notebook: Acer Aspire A315 I've just bought a new AMD Ryzen/Radeon notebook (Acer Aspire 3) and I wanted to install an Ubuntu/Kubuntu 18.04 on it. I checked the bios settings and uefi was the only boot option, so there is no legacy mode what I had used with my old computer before. I downloaded the normal iso image and made an usb boot pendrive using mkusb. The boot was okay, I got an uefi type menu but after starting the kernel it paniced(?) instantly. Error messages: ACPI Error [MAC0] Namespace lookup failure ACPI ERROR 1 table load failures, 13 successful BUG: soft lockup CPU#0 stuck for 22s ... ... EFI VGA framebuffer device clocksource tsc mask Switching to colour framebuffer device [28.040001] ... ... ... I've tried to boot the same pendrive on my girlfriend's Acer Travelmate with uefi and worked well. I searched and I found that the problem is maybe in connection with uefi framebuffer but I am not sure. Ubuntu 16.04 can be loaded with nomodeset and noacpi parameters but for 18.04 none of them are working. I tried 4.16,4.17 kernels too (replaced on live usb) but without any success. The result is totally equivalent. To manage notifications about this bug go to: https://bugs.launchpad.net/amd/+bug/1776563/+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
