resolves #296 use Ubuntu 22.04 by default (#334)

Author: slonopotamus

docs/advanced-build-options.adoc

@@ -248,9 +248,9 @@ ue4-docker build RELEASE --cuda
 
 [source,shell]
 ----
-# Uses the CUDA 10.0 base image
-ue4-docker build RELEASE --cuda=10.0
+# Uses the CUDA 12.2.0 base image
+ue4-docker build RELEASE --cuda=12.2.0
 {% endhighlight %}
 ----
 
-For a list of supported CUDA versions, see the list of Ubuntu 18.04 image tags for the https://hub.docker.com/r/nvidia/cuda/[nvidia/cuda] base image.
+For a list of supported CUDA versions, see the list of Ubuntu 22.04 image tags for the https://hub.docker.com/r/nvidia/cuda/[nvidia/cuda] base image.

docs/ue4-docker-build.adoc

@@ -34,7 +34,7 @@ See the xref:available-container-images.adoc[List of available container images]
 
 *-basetag* _basetag_::
 Operating system base image tag to use.
-For Linux this is the version of Ubuntu (default is ubuntu18.04).
+For Linux this is the version of Ubuntu (default is ubuntu22.04).
 For Windows this is the Windows Server Core base image tag (default is the host OS version)
 
 *-branch* _branch_::

src/ue4docker/infrastructure/BuildConfiguration.py

@@ -18,10 +18,10 @@
 }
 
 # The default ubuntu base to use
-DEFAULT_LINUX_VERSION = "ubuntu18.04"
+DEFAULT_LINUX_VERSION = "ubuntu22.04"
 
 # The default CUDA version to use when `--cuda` is specified without a value
-DEFAULT_CUDA_VERSION = "11.4"
+DEFAULT_CUDA_VERSION = "12.2.0"
 
 # The default memory limit (in GB) under Windows
 DEFAULT_MEMORY_LIMIT = 10.0
@@ -206,7 +206,7 @@ def addArguments(parser):
         parser.add_argument(
             "-basetag",
             default=None if platform.system() == "Windows" else DEFAULT_LINUX_VERSION,
-            help="Operating system base image tag to use. For Linux this is the version of Ubuntu (default is ubuntu18.04). "
+            help="Operating system base image tag to use. For Linux this is the version of Ubuntu (default is ubuntu22.04). "
             "For Windows this is the Windows Server Core base image tag (default is the host OS version)",
         )
         parser.add_argument(