Installing the AWS CFN helper scripts on Ubuntu 24.04. At the moment of writing, the aws-cfn-bootstrap-py3-latest.tar.gz helpers such as cfn-init and cfn-signal are not updated for python 3.12. A solution would be to use a virtual environment during bootstrapping or cloudinit.

gistfile1.txt

# This should be able to run in cfn-init / EC2 userdata
export DEBIAN_FRONTEND=noninteractive
export VENV_DIR=/opt/aws/cfn-bootstrap-venv
export HELPER_SCRIPTS_BIN_DIR=/opt/aws/bin

# Install python 3.11 from deadsnakes, this will not be the default python, that will stay on 3.12
apt update	
apt-get install -y tzdata software-properties-common # Maybe only required in docker?
add-apt-repository -y ppa:deadsnakes/ppa 
apt update
apt install -y python3.11 python3.11-venv 

# Set up a virtual env
mkdir -p ${VENV_DIR}	
python3.11 -m venv ${VENV_DIR}	
source ${VENV_DIR}/bin/activate

# Install the CFN helper scripts. These will link to the virtual environment & 3.11, not touching the 
# system standard python 3.12
pip3 install https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-latest.tar.gz
mkdir -p ${HELPER_SCRIPTS_BIN_DIR}	
ln -s ${VENV_DIR}/bin/cfn-* ${HELPER_SCRIPTS_BIN_DIR}
deactivate