diff --git a/configs/example/gem5_library/x86-ubuntu-run-with-kvm.py b/configs/example/gem5_library/x86-ubuntu-run-with-kvm.py
index fa84960..1aea258 100644
--- a/configs/example/gem5_library/x86-ubuntu-run-with-kvm.py
+++ b/configs/example/gem5_library/x86-ubuntu-run-with-kvm.py
@@ -121,7 +121,7 @@
     kernel=Resource("x86-linux-kernel-5.4.49"),
     # The x86 ubuntu image will be automatically downloaded to the if not
     # already present.
-    disk_image=Resource("x86-ubuntu-img"),
+    disk_image=Resource("x86-ubuntu-18.04-img"),
     readfile_contents=command,
 )
 
diff --git a/configs/example/gem5_library/x86-ubuntu-run.py b/configs/example/gem5_library/x86-ubuntu-run.py
index c6f6f83..2aee8c7 100644
--- a/configs/example/gem5_library/x86-ubuntu-run.py
+++ b/configs/example/gem5_library/x86-ubuntu-run.py
@@ -58,7 +58,7 @@
 # downloaded.
 board.set_kernel_disk_workload(
     kernel=Resource("x86-linux-kernel-5.4.49"),
-    disk_image=Resource("x86-ubuntu-img"),
+    disk_image=Resource("x86-ubuntu-18.04-img"),
 )
 
 simulator = Simulator(board=board)
diff --git a/tests/gem5/configs/boot_kvm_fork_run.py b/tests/gem5/configs/boot_kvm_fork_run.py
index 2cd180a..662ef23 100644
--- a/tests/gem5/configs/boot_kvm_fork_run.py
+++ b/tests/gem5/configs/boot_kvm_fork_run.py
@@ -203,7 +203,7 @@
         resource_directory=args.resource_directory,
     ),
     disk_image=Resource(
-        "x86-ubuntu-img",
+        "x86-ubuntu-18.04-img",
         resource_directory=args.resource_directory,
     ),
     readfile_contents=dedent(
diff --git a/tests/gem5/configs/boot_kvm_switch_exit.py b/tests/gem5/configs/boot_kvm_switch_exit.py
index 9f5f7ee..5cfee40 100644
--- a/tests/gem5/configs/boot_kvm_switch_exit.py
+++ b/tests/gem5/configs/boot_kvm_switch_exit.py
@@ -188,7 +188,7 @@
         resource_directory=args.resource_directory,
     ),
     disk_image=Resource(
-        "x86-ubuntu-img",
+        "x86-ubuntu-18.04-img",
         resource_directory=args.resource_directory,
     ),
     # The first exit signals to switch processors.
diff --git a/tests/gem5/configs/x86_boot_exit_run.py b/tests/gem5/configs/x86_boot_exit_run.py
index 5c8b025..93c9028 100644
--- a/tests/gem5/configs/x86_boot_exit_run.py
+++ b/tests/gem5/configs/x86_boot_exit_run.py
@@ -207,7 +207,7 @@
         resource_directory=args.resource_directory,
     ),
     disk_image=Resource(
-        "x86-ubuntu-img",
+        "x86-ubuntu-18.04-img",
         resource_directory=args.resource_directory,
     ),
     kernel_args=kernal_args,