Description

The Semaphore CI pipeline is failing intermittently for all PRs due to the ubuntu2004 OS image being in a brownout phase.

Error

OS image 'ubuntu2004' for machine type 'e1-standard-2' is currently in a brownout phase. Please use another OS image.

Example failure: https://checkstyle.semaphoreci.com/workflows/ccb1bd25-873d-4a63-878c-3664de347005?pipeline_id=0e3000af-cc22-4030-af7a-ab11e1c4719b

Root Cause

Ubuntu 20.04 image is being phased out by Semaphore CI as of March 2026.

Machine types docs (deprecation notice): https://docs.semaphore.io/reference/machine-types

"The Ubuntu 20.04 image will be phased out by March 2026"