Bump minimum ubuntu runner version to 22.04 since 20.04 is deprecated as of April 16, 2025

Author: yambati03

.github/workflows/build-linux.yml

@@ -3,9 +3,9 @@ name: Linux CI
 on:
   pull_request:
     paths-ignore:
-      - '**.md'
-      - '**.ipynb' 
-      - 'myst.yml'
+      - "**.md"
+      - "**.ipynb"
+      - "myst.yml"
 
 # Every time you make a push to your PR, it cancel immediately the previous checks,
 # and start a new one. The other runner will be available more quickly to your PR.
@@ -31,22 +31,22 @@ jobs:
         # See https://help.github.com/en/articles/workflow-syntax-for-github-actions.
         name: [
             # "Bracket" the versions from GCC [9-14] and Clang [9-16]
-            ubuntu-20.04-gcc-9,
-            ubuntu-20.04-clang-9,
+            ubuntu-22.04-gcc-9,
+            ubuntu-22.04-clang-9,
             ubuntu-24.04-gcc-14,
             ubuntu-24.04-clang-16,
           ]
 
         build_type: [Debug, Release]
         build_unstable: [ON]
         include:
-          - name: ubuntu-20.04-gcc-9
-            os: ubuntu-20.04
+          - name: ubuntu-22.04-gcc-9
+            os: ubuntu-22.04
             compiler: gcc
             version: "9"
 
-          - name: ubuntu-20.04-clang-9
-            os: ubuntu-20.04
+          - name: ubuntu-22.04-clang-9
+            os: ubuntu-22.04
             compiler: clang
             version: "9"
 

README.md

@@ -15,11 +15,11 @@ matrices.
 
 The current support matrix is:
 
-| Platform           | Compiler  | Build Status                                                                     |
-|:------------------:|:---------:|:--------------------------------------------------------------------------------:|
-| Ubuntu 20.04/22.04 | gcc/clang | ![Linux CI](https://github.com/borglab/gtsam/workflows/Linux%20CI/badge.svg)     |
-| macOS              | clang     | ![macOS CI](https://github.com/borglab/gtsam/workflows/macOS%20CI/badge.svg)     |
-| Windows            | MSVC      | ![Windows CI](https://github.com/borglab/gtsam/workflows/Windows%20CI/badge.svg) |
+|   Platform   | Compiler  |                                   Build Status                                   |
+| :----------: | :-------: | :------------------------------------------------------------------------------: |
+| Ubuntu 22.04 | gcc/clang |   ![Linux CI](https://github.com/borglab/gtsam/workflows/Linux%20CI/badge.svg)   |
+|    macOS     |   clang   |   ![macOS CI](https://github.com/borglab/gtsam/workflows/macOS%20CI/badge.svg)   |
+|   Windows    |   MSVC    | ![Windows CI](https://github.com/borglab/gtsam/workflows/Windows%20CI/badge.svg) |
 
 
 On top of the C++ library, GTSAM includes [wrappers for MATLAB & Python](#wrappers).