diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f730a3b..28440f2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -187,6 +187,14 @@ jobs:
         scripts/ubuntu_debootstrap.sh jammy ${{ matrix.arch }}
         SUDO=1 ROOTFS_DIR=./rootfs/ubuntu-jammy-${{ matrix.arch }} CPIO_FILE=ubuntu-jammy-${{ matrix.arch }}.cpio.gz make rootfs-overlay
 
+        scripts/ubuntu_rootfs.sh 22.04 ${{ matrix.arch }}
+        ROOTFS_DIR=./rootfs/ubuntu-22.04-${{ matrix.arch }} CPIO_FILE=ubuntu-22.04-${{ matrix.arch }}.cpio.gz make cpio
+        rm -rf ./rootfs/ubuntu-22.04-${{ matrix.arch }}
+
+        scripts/ubuntu_rootfs.sh 22.04 ${{ matrix.arch }}
+        ROOTFS_DIR=./rootfs/ubuntu-22.04-${{ matrix.arch }} ROOTFS=${ROOTFS_DIR}.img CPIO_FILE=ubuntu-22.04-${{ matrix.arch }}.cpio.gz make rootfs-overlay
+        rm -rf ./rootfs/ubuntu-22.04-${{ matrix.arch }}
+
     - name: Setup shared/init.sh
       run: |
         mkdir shared
@@ -196,10 +204,11 @@ jobs:
     - name: Run kernel
       run: |
         QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME make run
-        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME ROOTFS=./rootfs/ubuntu-jammy-${{ matrix.arch }}.img make run
+        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME ROOTFS=./rootfs-${{ matrix.arch }} make run
+        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME ROOTFS=./rootfs/ubuntu-22.04-${{ matrix.arch }}.img make run
         QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME INITRD=1 make run
-        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME INITRD=./ubuntu-jammy-${{ matrix.arch }}.cpio.gz make run
-        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME CPU=2 MEM=2048M QEMU_EXTRA_ARGS="" QEMU_EXTRA_KERNEL_CMDLINE="nokaslr" ROOTFS=./alpine-${{ matrix.arch }}.img make run
+        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME INITRD=./ubuntu-22.04-${{ matrix.arch }}.cpio.gz make run
+        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME CPU=2 MEM=2048M QEMU_EXTRA_ARGS="" QEMU_EXTRA_KERNEL_CMDLINE="nokaslr" make run
 
     - name: Upload rootfs artifact
       uses: actions/upload-artifact@v3
diff --git a/.gitignore b/.gitignore
index 58dcc52..a00fa18 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 /rootfs/*.cpio.gz
 /rootfs/alpine-*/
 /rootfs/ubuntu-*/
+/rootfs/ubuntu-*.tar.gz
 
 /toolchain
 /shared
diff --git a/scripts/ubuntu_rootfs.sh b/scripts/ubuntu_rootfs.sh
new file mode 100755
index 0000000..14855a7
--- /dev/null
+++ b/scripts/ubuntu_rootfs.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -o errexit
+
+CWD=$(dirname -- "$0")
+ROOT_DIR="$(realpath ${CWD}/..)"
+
+version="${1:-22.04}"
+arch="${2:-x86_64}"
+orig_arch="$arch"
+
+if [[ "$arch" == x86_64 ]]; then
+    arch=amd64
+elif [[ "$arch" != arm64 ]]; then
+    echo "usage: $0 VERSION [x86_64 | arm64]"
+    exit 1
+fi
+
+URL="https://cdimage.ubuntu.com/ubuntu-base/releases/$%7Bversion%7D/release"
+FILEPATH="${ROOT_DIR}/rootfs/ubuntu-base-${version}-base-${arch}.tar.gz"
+DIR="${ROOT_DIR}/rootfs/ubuntu-${version}-${orig_arch}"
+
+wget --no-verbose --show-progress "$URL/ubuntu-base-${version}-base-${arch}.tar.gz" -O "$FILEPATH"
+mkdir -p "$DIR"
+tar -xf "$FILEPATH" -C "$DIR"
+
+echo "Ubuntu ${version} rootfs extracted to ${DIR}"