diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bf0cb8afd..1334aa08c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ on:
 jobs:
   linux:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     strategy:
       fail-fast: true
       matrix:
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 22d0b5789..4f6b2f68b 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -7,7 +7,7 @@ on:
 jobs:
   linux:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@v1
     - name: Install dependencies
diff --git a/.github/workflows/release-candidate.yml b/.github/workflows/release-candidate.yml
index 45472c413..e4ca67c67 100644
--- a/.github/workflows/release-candidate.yml
+++ b/.github/workflows/release-candidate.yml
@@ -8,7 +8,7 @@ on:
 jobs:
   linux:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@v1
     - name: Create linux package