diff --git a/.github/workflows/checkstyle.yaml b/.github/workflows/checkstyle.yaml
index 0b7b82fc19..7b48d80c73 100644
--- a/.github/workflows/checkstyle.yaml
+++ b/.github/workflows/checkstyle.yaml
@@ -13,8 +13,10 @@ jobs:
         ref: ${{ github.event.pull_request.head.sha }}
     - name: Install dependencies
       run: |
-        sudo apt-get update
-        sudo apt-get -qq upgrade
+        # https://github.com/orgs/community/discussions/47863
+        sudo apt-mark hold grub-efi-amd64-signed
+        sudo apt-get update --fix-missing
+        sudo apt-get upgrade
         sudo apt-get install --yes -qq build-essential autoconf libtool gawk alien fakeroot linux-headers-$(uname -r)
         sudo apt-get install --yes -qq zlib1g-dev uuid-dev libattr1-dev libblkid-dev libselinux-dev libudev-dev libssl-dev python-dev python-setuptools python-cffi python3 python3-dev python3-setuptools python3-cffi
         # packages for tests
diff --git a/.github/workflows/zfs-tests-functional.yml b/.github/workflows/zfs-tests-functional.yml
index a3913b531f..403b20a404 100644
--- a/.github/workflows/zfs-tests-functional.yml
+++ b/.github/workflows/zfs-tests-functional.yml
@@ -17,8 +17,10 @@ jobs:
         ref: ${{ github.event.pull_request.head.sha }}
     - name: Install dependencies
       run: |
-        sudo apt-get update
-        sudo apt-get -qq upgrade
+        # https://github.com/orgs/community/discussions/47863
+        sudo apt-mark hold grub-efi-amd64-signed
+        sudo apt-get update --fix-missing
+        sudo apt-get upgrade
         sudo apt-get install --yes -qq build-essential autoconf libtool gdb lcov \
           git alien fakeroot wget curl bc fio acl \
           sysstat mdadm lsscsi parted gdebi attr dbench watchdog ksh \
diff --git a/.github/workflows/zfs-tests-sanity.yml b/.github/workflows/zfs-tests-sanity.yml
index 34518428f6..4b77650465 100644
--- a/.github/workflows/zfs-tests-sanity.yml
+++ b/.github/workflows/zfs-tests-sanity.yml
@@ -13,8 +13,10 @@ jobs:
         ref: ${{ github.event.pull_request.head.sha }}
     - name: Install dependencies
       run: |
-        sudo apt-get update
-        sudo apt-get -qq upgrade
+        # https://github.com/orgs/community/discussions/47863
+        sudo apt-mark hold grub-efi-amd64-signed
+        sudo apt-get update --fix-missing
+        sudo apt-get upgrade
         sudo apt-get install --yes -qq build-essential autoconf libtool gdb lcov \
           git alien fakeroot wget curl bc fio acl \
           sysstat mdadm lsscsi parted gdebi attr dbench watchdog ksh \
diff --git a/.github/workflows/zloop.yml b/.github/workflows/zloop.yml
index b9976264bf..f6b54d5f05 100644
--- a/.github/workflows/zloop.yml
+++ b/.github/workflows/zloop.yml
@@ -15,8 +15,10 @@ jobs:
         ref: ${{ github.event.pull_request.head.sha }}
     - name: Install dependencies
       run: |
-        sudo apt-get update
-        sudo apt-get -qq upgrade
+        # https://github.com/orgs/community/discussions/47863
+        sudo apt-mark hold grub-efi-amd64-signed
+        sudo apt-get update --fix-missing
+        sudo apt-get upgrade
         sudo apt-get install --yes -qq build-essential autoconf libtool gdb \
           git alien fakeroot \
           zlib1g-dev uuid-dev libblkid-dev libselinux-dev \