"apt update" fails in jupyter/tensorflow-notebook CLI

I’m running a jupyter/tensorflow-notebook container and I need to install a library which needs requires an apt update followed by an apt install build-essential prior to installation.

When I run the command in the CLI for the container I get the following error:

Err:1 http://security.ubuntu.com/ubuntu focal-security InRelease                                        
  Could not connect to security.ubuntu.com:80 (91.189.91.38), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.39), connection timed out
Err:2 http://archive.ubuntu.com/ubuntu focal InRelease                                                  
  Could not connect to archive.ubuntu.com:80 (91.189.88.152), connection timed out Could not connect to archive.ubuntu.com:80 (91.189.88.142), connection timed out
Err:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
  Unable to connect to archive.ubuntu.com:http:
Err:4 http://archive.ubuntu.com/ubuntu focal-backports InRelease
  Unable to connect to archive.ubuntu.com:http:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal/InRelease  Could not connect to archive.ubuntu.com:80 (91.189.88.152), connection timed out Could not connect to archive.ubuntu.com:80 (91.189.88.142), connection timed out
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease  Unable to connect to archive.ubuntu.com:http:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-backports/InRelease  Unable to connect to archive.ubuntu.com:http:
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-security/InRelease  Could not connect to security.ubuntu.com:80 (91.189.91.38), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.39), connection timed out
W: Some index files failed to download. They have been ignored, or old ones used instead.
# 

I was hoping someone may have some insight or advice to offer as I’m completely lost with this one.

I’m pulling what little hair I have out..!

Source: Python-3x Questions

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