5 min read

Technical Blog 1: BIOS Issues and Ubuntu

Troubleshooting BIOS/UEFI, Secure Boot, and firmware issues on Ubuntu, notes from a community thread and a practical checklist.

Every week, I try to learn something new in the tech space and share my perspective. This week I explored the Ubuntu Community Discourse and was drawn to a post titled"Issues with motherboard BIOS issues appearing on Ubuntu". The original poster described a frustrating experience on a new ASRock motherboard: stuck in manufacturing mode, hardware security checks failing, and kernel update attempts introducing “bad shim signature” errors, even after OS reinstalls and firmware updates.

What made the discussion fascinating (and a bit daunting) is how quickly troubleshooting becomes layered when hardware, firmware, and the OS intersect. Suggestions spanned UEFI and Secure Boot toggles, vendor firmware tools, and the Linux Vendor Firmware Service (LVFS). It was a reminder that progress often requires patience, methodical testing, and sometimes imperfect workarounds, like disabling Secure Boot temporarily or reverting kernels.

Why BIOS + Ubuntu Gets Tricky

Secure Boot & Shim

Signature verification can break boot flows when firmware, shim, or kernels get out of sync.

Vendor Firmware

Motherboard tools and LVFS coexist; ordering and versions matter more than we think.

UEFI Settings

Manufacturing mode, TPM, and PK/KEK/DB entries can create failure modes that look like OS bugs.

Practical Checklist

  1. Document current firmware versions before making changes.
  2. Test Secure Boot toggles and re-enroll keys only after confirming firmware updates succeed.
  3. Use LVFS for vendor-approved updates but validate against motherboard utilities.
  4. Keep a known-good kernel around. Boot it if a new kernel triggers shim errors.
  5. Lean on community logs-dmesg, journalctl, and fwupdmgr output often hint at the root cause.

Tags

Linux
Ubuntu
Firmware