Migrate to Ubuntu 24.04

.github/workflows/docker.yml

@@ -18,6 +18,7 @@ defaults:
     shell: bash -xeuo pipefail {0}
 
 env:
+  # odeprecated: remove 22.04 image in Homebrew >=5.4
   VERSIONS: '["22.04", "24.04"]'
 
 jobs:
@@ -71,15 +72,15 @@ jobs:
                 "ghcr.io/homebrew/ubuntu${version}:${brew_version}"
                 "ghcr.io/homebrew/ubuntu${version}:latest"
               )
-              if [[ "${version}" == "22.04" ]]; then
+              if [[ "${version}" == "24.04" ]]; then
                 tags+=(
                   "ghcr.io/homebrew/brew:${brew_version}"
                   "ghcr.io/homebrew/brew:latest"
                 )
               fi
             elif [[ "${GITHUB_EVENT_NAME}" == "push" &&
                     ("${GITHUB_REF}" == "refs/heads/main") ]]; then
-              if [[ "${version}" == "22.04" ]]; then
+              if [[ "${version}" == "24.04" ]]; then
                 tags+=("ghcr.io/homebrew/brew:main")
               fi
               tags+=("ghcr.io/homebrew/ubuntu${version}:main")
@@ -138,6 +139,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # odeprecated: remove 22.04 image in Homebrew >=5.4
         version: ["22.04", "24.04"]
         arch: ["x86_64", "arm64"]
 
@@ -162,6 +164,11 @@ jobs:
           VERSION: ${{ matrix.version }}
           PUSH: ${{ needs.generate-tags.outputs.push }}
         run: |
+          # odeprecated: remove 22.04 image in Homebrew >=5.4
+          if [[ "${VERSION}" == "22.04" ]]; then
+            echo "The homebrew/ubuntu22.04 image is deprecated and will soon be retired. Use homebrew/brew." > .docker-deprecate
+          fi
+
           filter="$(printf '.["%s"]' "${VERSION}")"
           echo "push=$(jq --raw-output "${filter}" <<<"${PUSH}")" >>"${GITHUB_OUTPUT}"
 
@@ -182,8 +189,13 @@ jobs:
           build-args: version=${{ matrix.version }}
           labels: ${{ needs.generate-tags.outputs.labels }}
 
+      - name: Set environment variables
+        if: matrix.version == '22.04'
+        # odeprecated: remove 22.04 in Homebrew >=5.4
+        run: echo "HOMEBREW_GLIBC_TESTING=1" >> "$GITHUB_ENV"
+
       - name: Run brew test-bot --only-setup
-        run: docker run --rm brew brew test-bot --only-setup
+        run: docker run --env HOMEBREW_GLIBC_TESTING --rm brew brew test-bot --only-setup
 
       - name: Log in to GitHub Packages (BrewTestBot)
         if: fromJSON(steps.attributes.outputs.push)

.github/workflows/tests.yml

@@ -330,11 +330,11 @@ jobs:
             container: ghcr.io/homebrew/ubuntu24.04:latest
           - name: test-bot (Linux x86_64)
             runs-on: ubuntu-latest
-            container: ghcr.io/homebrew/brew:main
-          # Use Debian Old Stable for testing Homebrew's glibc support.
+            container: ghcr.io/homebrew/ubuntu24.04:main
+          # Use older Ubuntu for testing Homebrew's glibc and gcc support.
           - name: test-bot (Linux Homebrew glibc)
             runs-on: ubuntu-latest
-            container: debian:oldstable
+            container: ubuntu:22.04
           - name: test-bot (macOS x86_64)
             runs-on: macos-15-intel
           - name: test-bot (macOS arm64)
@@ -345,7 +345,9 @@ jobs:
       - name: Install Homebrew and Homebrew's dependencies
         # All other images are built from our Homebrew Dockerfile.
         # This is the only one that needs to be set up manually.
-        if: matrix.container == 'debian:oldstable'
+        if: matrix.container == 'ubuntu:22.04'
+        env:
+          DEBIAN_FRONTEND: noninteractive
         run: |
           # Slimmed down version from the Homebrew Dockerfile
           apt-get update

Dockerfile

@@ -1,4 +1,4 @@
-ARG version=22.04
+ARG version=24.04
 # version is passed through by Docker.
 # shellcheck disable=SC2154
 FROM ubuntu:"${version}"

Library/Homebrew/os.rb

@@ -46,12 +46,12 @@ def self.kernel_name
   ::OS_VERSION = T.let(ENV.fetch("HOMEBREW_OS_VERSION").freeze, String)
 
   # See Linux-CI.md
-  LINUX_CI_OS_VERSION = "Ubuntu 22.04"
-  LINUX_CI_ARM_RUNNER = "ubuntu-22.04-arm"
-  LINUX_GLIBC_CI_VERSION = "2.35"
+  LINUX_CI_OS_VERSION = "Ubuntu 24.04"
+  LINUX_CI_ARM_RUNNER = "ubuntu-24.04-arm"
+  LINUX_GLIBC_CI_VERSION = "2.39"
   LINUX_GLIBC_NEXT_CI_VERSION = "2.39" # users below this version will be warned by `brew doctor`
-  LINUX_GCC_CI_VERSION = "12" # https://packages.ubuntu.com/jammy/gcc-12
-  LINUX_LIBSTDCXX_CI_VERSION = "6.0.30" # https://packages.ubuntu.com/jammy/libstdc++6
+  LINUX_GCC_CI_VERSION = "13" # https://packages.ubuntu.com/noble/gcc
+  LINUX_LIBSTDCXX_CI_VERSION = "6.0.33" # https://packages.ubuntu.com/noble/libstdc++6
   LINUX_PREFERRED_GCC_COMPILER_FORMULA = T.let("gcc@#{LINUX_GCC_CI_VERSION}".freeze, String)
   LINUX_PREFERRED_GCC_RUNTIME_FORMULA = "gcc"
 

docs/Linux-CI.md

@@ -4,7 +4,7 @@ last_review_date: "2026-03-19"
 
 # Linux CI in `homebrew/core`
 
-We currently use Ubuntu 22.04 for bottling in `homebrew/core`.
+We currently use Ubuntu 24.04 for bottling in `homebrew/core`.
 
 We aim to use the oldest supported Ubuntu LTS version for our CI that provides the GCC version we need.
 

docs/Support-Tiers.md

@@ -43,7 +43,7 @@ To qualify as Tier 1, a Linux configuration must meet all of the following:
 - Running on:
   - Ubuntu within its [standard support window](https://ubuntu.com/about/release-cycle) or
   - a Homebrew-provided Docker image
-- Using a system `glibc` version ≥ 2.35
+- Using a system `glibc` version ≥ 2.39
 - Using a Linux kernel version ≥ 3.2
 - Installed in the default prefix: `/home/linuxbrew/.linuxbrew`
 - Using a supported architecture (ARM64/AArch64 or Intel x86_64 with SSSE3 support)
@@ -67,7 +67,7 @@ Tier 2 configurations include:
 
 - macOS prerelease versions before they are promoted to Tier 1
 - macOS systems with outdated versions of Xcode Command Line Tools
-- Linux systems with `glibc` versions between 2.13 and 2.34 (Homebrew’s own `glibc` formula will be installed automatically)
+- Linux systems with `glibc` versions between 2.13 and 2.38 (Homebrew’s own `glibc` formula will be installed automatically)
 - Homebrew installed outside the default prefix, requiring source builds for official packages (i.e. installing outside `/opt/homebrew`, `/usr/local`, or `/home/linuxbrew/.linuxbrew`)
 - Architectures not yet officially supported by Homebrew
 - Macs using OpenCore Legacy Patcher with a Westmere or newer Intel CPU