diff --git a/.github/workflows/submit.yml b/.github/workflows/submit.yml
index d0817aa7241..5333ec0f1c9 100644
--- a/.github/workflows/submit.yml
+++ b/.github/workflows/submit.yml
@@ -14,7 +14,7 @@ on:
 jobs:
   prerequisites:
     name: Prerequisites
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     outputs:
       should_run: ${{ steps.check_submit.outputs.should_run }}
       bundle_id: ${{ steps.check_bundle_id.outputs.bundle_id }}
@@ -88,7 +88,7 @@ jobs:
         if: steps.check_submit.outputs.should_run != 'false' && steps.jtreg.outputs.cache-hit != 'true'
 
       - name: Build jtreg
-        run: sh make/build-all.sh ${JAVA_HOME}
+        run: sh make/build-all.sh ${JAVA_HOME_8_X64}
         working-directory: jtreg
         if: steps.check_submit.outputs.should_run != 'false' && steps.jtreg.outputs.cache-hit != 'true'
 
@@ -106,7 +106,7 @@ jobs:
 
   linux_x64_build:
     name: Linux x64
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs: prerequisites
     if: needs.prerequisites.outputs.should_run != 'false' && needs.prerequisites.outputs.platform_linux_x64 != 'false'
 
@@ -189,7 +189,9 @@ jobs:
           path: gtest
 
       - name: Install dependencies
-        run: sudo apt-get install libxrandr-dev libxtst-dev libcups2-dev libasound2-dev
+        run: |
+          sudo apt-get install gcc-10=10.2.0-5ubuntu1~20.04 g++-10=10.2.0-5ubuntu1~20.04 libxrandr-dev libxtst-dev libcups2-dev libasound2-dev
+          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 100 --slave /usr/bin/g++ g++ /usr/bin/g++-10
 
       - name: Configure
         run: >
@@ -221,7 +223,7 @@ jobs:
 
   linux_x64_test:
     name: Linux x64
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs:
       - prerequisites
       - linux_x64_build
@@ -400,7 +402,7 @@ jobs:
 
   linux_aarch64_build:
     name: Linux aarch64
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs:
       - prerequisites
       - linux_x64_build
@@ -536,7 +538,7 @@ jobs:
 
   linux_arm_build:
     name: Linux arm
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs:
       - prerequisites
       - linux_x64_build
@@ -672,7 +674,7 @@ jobs:
 
   linux_s390x_build:
     name: Linux s390x
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs:
       - prerequisites
       - linux_x64_build
@@ -808,7 +810,7 @@ jobs:
 
   linux_ppc64le_build:
     name: Linux ppc64le
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs:
       - prerequisites
       - linux_x64_build
@@ -944,7 +946,7 @@ jobs:
 
   linux_x86_build:
     name: Linux x86
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs: prerequisites
     if: needs.prerequisites.outputs.should_run != 'false' && needs.prerequisites.outputs.platform_linux_x86 != 'false'
 
@@ -1018,7 +1020,8 @@ jobs:
         run: |
           sudo dpkg --add-architecture i386
           sudo apt-get update
-          sudo apt-get install gcc-multilib g++-multilib libfreetype6-dev:i386 libxrandr-dev:i386 libxtst-dev:i386 libtiff-dev:i386 libcupsimage2-dev:i386 libcups2-dev:i386 libasound2-dev:i386
+          sudo apt-get install gcc-10-multilib g++-10-multilib libfreetype6-dev:i386 libxrandr-dev:i386 libxtst-dev:i386 libtiff-dev:i386 libcupsimage2-dev:i386 libcups2-dev:i386 libasound2-dev:i386
+          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 100 --slave /usr/bin/g++ g++ /usr/bin/g++-10
 
       - name: Configure
         run: >
@@ -1051,7 +1054,7 @@ jobs:
 
   linux_x86_test:
     name: Linux x86
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     needs:
       - prerequisites
       - linux_x86_build
@@ -1842,7 +1845,7 @@ jobs:
 
   artifacts:
     name: Post-process artifacts
-    runs-on: "ubuntu-latest"
+    runs-on: "ubuntu-20.04"
     if: always()
     continue-on-error: true
     needs: