diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index bdaeb3dc4f..1978e3e246 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -40,7 +40,7 @@ jobs:
           - ${{ github.event_name == 'cron' }}
         config:
           - name: "CMake, PETSc unreleased, ADIOS2"
-            os: ubuntu-20.04
+            os: ubuntu-24.04
             cmake_options: "-DBUILD_SHARED_LIBS=ON
                             -DBOUT_ENABLE_METRIC_3D=ON
                             -DBOUT_ENABLE_OPENMP=ON
@@ -58,13 +58,13 @@ jobs:
             build_adios2: true
             on_cron: true
 
-          - name: "Default options, Ubuntu 20.04"
-            os: ubuntu-20.04
+          - name: "Default options, Ubuntu 22.04"
+            os: ubuntu-22.04
             cmake_options: ""
             on_cron: false
 
           - name: "Optimised, static"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             cmake_options: "-DCHECK=0
                             -DBUILD_SHARED_LIBS=OFF
                             -DCMAKE_CXX_FLAGS=-Ofast
@@ -78,7 +78,7 @@ jobs:
             on_cron: false
 
           - name: "Debug, shared"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             cmake_options: "-DCHECK=3
                             -DCMAKE_BUILD_TYPE=Debug
                             -DBOUT_ENABLE_SIGNAL=ON
@@ -89,8 +89,8 @@ jobs:
                             -DSUNDIALS_ROOT=/home/runner/local"
             on_cron: false
 
-          - name: "Shared, release, Ubuntu 20.04"
-            os: ubuntu-20.04
+          - name: "Shared, release"
+            os: ubuntu-latest
             cmake_options: "-DBUILD_SHARED_LIBS=ON
                             -DBOUT_ENABLE_OPENMP=ON
                             -DCMAKE_BUILD_TYPE=Release
@@ -116,7 +116,7 @@ jobs:
             on_cron: false
 
           - name: "CMake, new PETSc"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             cmake_options: "-DBUILD_SHARED_LIBS=ON
                             -DBOUT_ENABLE_METRIC_3D=ON
                             -DBOUT_ENABLE_OPENMP=ON
@@ -131,7 +131,7 @@ jobs:
             on_cron: false
 
           - name: "Coverage"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             cmake_options: "-DBUILD_SHARED_LIBS=ON
                             -DCMAKE_BUILD_TYPE=Debug
                             -DCHECK=3
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f57a78a14a..5e1924ba1e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -794,8 +794,15 @@ foreach (flag ${CONFIG_LDFLAGS_LIST})
       # message("${flag} is a file")
       set(_CONFIG_LDFLAGS "${_CONFIG_LDFLAGS} ${flag}")
     else()
-      message("Fixing ${flag} to -l${flag}")
-      set(_CONFIG_LDFLAGS "${_CONFIG_LDFLAGS} -l${flag}")
+      string(FIND "${flag}" "::" hascolcol)
+      if (${hascolcol} EQUAL -1)
+	message("Fixing ${flag} to -l${flag}")
+	set(_CONFIG_LDFLAGS "${_CONFIG_LDFLAGS} -l${flag}")
+      else()
+	string(REGEX MATCH "[^:]*$" flag2 "${flag}")
+	message("Fixing ${flag} to -l${flag2}")
+	set(_CONFIG_LDFLAGS "${_CONFIG_LDFLAGS} -l${flag2}")
+      endif()
     endif()
   endif()
 endforeach()