I'm a non-techy user confirming this bug after 9-10 hours troubleshooting (still not successful). Here's my info, copied/pasted from the OP's above, with my own details subbed in. Sorry, some of this may not be helpful, since I really don't know what I'm doing.
System Information Hardware: Dell Inspiron 14 GPU: RYZEN 7000 / RADEON graphics (no idea current versions since I can't check anything) OS: Linux Mint 21.2 Victoria (based on Ubuntu 22.04 LTS) Affected Kernel: 5.15.0-160-generic I can't get the earlier kernel to boot either (5.15.0-157-generic) Date Issue Occurred: October 18, 2025 immediately after updating Problem Description Identical to OP's. Pressing keys during start up doesn't bring up the BIOS/UEFI at all. Escape only gets me to the "grub>" prompt. After hours of searching online, I figured out how to use the grub> command lines. Here's what I'm inputting: grub> set root=(hd0,gpt2) grub> linux /boot/vmlinuz-5.15.0-160-generic root=/dev/sda2 quiet splash nomodeset grub> initrd /boot/initrd.img-5.15.0-160-generic grub> boot This results in 30 seconds of the LM logo appearing, followed by a black screen with the following errors: "[0.329449] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCIO.LPCO.ECO], AE_NOT_FOUND (20210730/dswload2-162) [0.329466] ACPI Error: AE_NOT_FOUND, During name lookup/catalog (20210730/ps object-220) [2.381532] [drm: amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting. BusyBox v1.30.1 (Ubuntu 1:1.30.1-7ubuntu3.1) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs)" When I try to boot the previous 157 version instead, I don't get the amdgpu error, but I do get the first two (ACPI BIOS Error). Fortunately, I have an older computer I can work off of while this bug is fixed, and I have backups of my docs. But if it weren't for that, I'd be totally sunk at this point. I don't understand the OP's solution above and will need many more hours to find out about graphics before feeling comfy trying anything, lol. HUGE thanks to those of you with the skills and good-will to troubleshoot things like this! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2128904 Title: Major Issues Following Release of 5.15.0-160-generic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2128904/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
