This "tutorial" is more for myself as I always find it annoyingly hard to get awscli up and running on various distros, with third party object storage support. Especially in these times when there's two versions, anyway, to install on Debian/Ubuntu, start with installing the client, v1

sudo apt install python3-pip awscli

This also installs python3-pip, which allows the plugin extension. Once done, install the plugin extension using pip3 as below.

sudo pip3 install awscli-plugin-endpoint

Then setup ~/.aws/credentials

[default]
aws_access_key_id=<your_id>
aws_secret_access_key=<your_key>

And finally setup ~/.aws/config

[plugins]
endpoint = awscli_plugin_endpoint
#cli_legacy_plugin_path = /usr/lib/python3.10/site-packages

[profile default]
region = <region>
s3 =
  endpoint_url = <url>
  signature_version = s3v4
  max_concurrent_requests = 100
  max_queue_size = 1000
  multipart_threshold = 50MB
  multipart_chunksize = 10MB
s3api =
  endpoint_url = <url>

Use cli_legacy_plugin_path when awscli v2 is available and supports the plugin properly on your system.