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build-pr CI check broken: qemu-user-static unavailable on Ubuntu 26.04 runners #3142
Description
What happened
On PR #3140, the build-pr check failed in 14 seconds. The workflow at .github/workflows/build_pr.yaml runs sudo apt install -y buildah qemu-user-static, which errors: "Package 'qemu-user-static' has no installation candidate" on Ubuntu 26.04. This is systemic — the last 10 build-pr runs across all branches fail with the same error. Every PR shows a red image-build check that has nothing to do with code quality.
What could go better
Like the bandit failure, a perpetually failing build check creates CI noise that degrades developer and agent trust in CI signals. It is impossible for agents to use this check as a signal for image build correctness when it never passes. High confidence: the root cause is confirmed — the qemu-user-static package is not available in Ubuntu 26.04 default repositories.
Proposed change
Update .github/workflows/build_pr.yaml to fix the qemu-user-static installation. Recommended approach: pin the runner to ubuntu-24.04 where the package is available (runs-on: ubuntu-24.04). Alternative: install qemu-user-static from an alternative source compatible with Ubuntu 26.04, or use a container-based action that bundles the required qemu binaries.
Validation criteria
The build-pr check should pass (or fail only on actual build issues) on the next 3 PRs after the fix. Verify on both main and release/0.6 branches.
Related issues checked
Searched: build-pr repo:lightspeed-core/lightspeed-stack is:issue; qemu-user-static ubuntu repo:fullsend-ai/fullsend repo:fullsend-ai/agents repo:lightspeed-core/lightspeed-stack is:issue; qemu repo:lightspeed-core/lightspeed-stack is:issue; buildah qemu repo:lightspeed-core/lightspeed-stack is:issue
No overlapping issues found.
Generated by retro agent from #3140
Activity
fullsend-ai-triage commentedon Nov 3, 2026
🤖 Finished Triage · ✅ Success · Started 4:25 PM UTC · Completed 4:28 PM UTC
Commit:
06b5567· View workflow run →Runtime: pi · Model: opus → claude-opus-4-6 · Effort: high · Cost: $0.51
fullsend-ai-triage commentedon Nov 3, 2026
⚠ Workflow change required — manual intervention needed.
The fix for this issue requires modifying
.github/workflows/build_pr.yaml, which the code agent cannot do under current permissions. A human must open the PR.The recommended fix is to pin the runner:
This restores access to
qemu-user-staticwhile a longer-term solution (e.g., sourcing qemu binaries independently of the runner OS) can be evaluated.Related: #3141 tracks a similar Ubuntu 26.04 runner breakage for the bandit CI check — both issues stem from the
ubuntu-latestalias advancing to 26.04.Proposed test:
Next steps:
/fs-code— agent creates a PR to implement this issue/fs-code <your instruction>— agent implements with your specific guidance