Update the Ubuntu docker image to the latest version

ci/docker/aarch64-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/arm-unknown-linux-gnueabi/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/arm-unknown-linux-gnueabihf/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/armv7-unknown-linux-gnueabihf/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/i586-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/i686-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/mips-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 
 RUN apt-get update && \

ci/docker/mips64-unknown-linux-gnuabi64/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/mips64el-unknown-linux-gnuabi64/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/mipsel-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 
 RUN apt-get update && \

ci/docker/powerpc-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 
 RUN apt-get update && \

ci/docker/powerpc64-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 
 RUN apt-get update && \

ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 
 RUN apt-get update && \

ci/docker/thumbv6m-none-eabi/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/thumbv7em-none-eabi/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/thumbv7em-none-eabihf/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/thumbv7m-none-eabi/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/x86_64-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-ARG IMAGE=ubuntu:18.04
+ARG IMAGE=ubuntu:24.04
 FROM $IMAGE
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/run-docker.sh

@@ -76,7 +76,7 @@ if [ "${1:-}" = "--help" ] || [ "$#" -gt 1 ]; then
     usage: ./ci/run-docker.sh [target]
 
     you can also set DOCKER_BASE_IMAGE to use something other than the default
-    ubuntu:18.04 (or rustlang/rust:nightly).
+    ubuntu:24.04 (or rustlang/rust:nightly).
   "
   exit
 fi