Linux Mastering Development Ubuntu

UBUNTU 20.04 LTS. Can’t run updates. Says version unsupported

I did the upgrade to 20.04 about 4 months ago. I downloaded it from the page that kept sending me upgrade messages, and did a fresh install on my new SSD. All worked well, updating software multiple times in the past few months from South African servers. I am now in North Africa. I tried to load Brother Printer drivers for a DCP-T300. It said I needed to update. Update said it couldn’t download from SA server. I the changed to MAIN SERVER. It has given me issues the whole week, finally, on a post, I saw to run cat /etc/apt/sources.list

# deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb focal universe
# deb-src focal universe
deb focal-updates universe
# deb-src focal-updates universe

 This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb focal partner
# deb-src focal partner

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

Err:1 focal InRelease
  506  Failure To Connect To Web Server [IP: 80]
Err:2 focal-updates InRelease
  506  Failure To Connect To Web Server [IP: 80]
Err:3 focal-backports InRelease
  506  Failure To Connect To Web Server [IP: 80]
Err:4 focal-security InRelease
  506  Failure To Connect To Web Server [IP: 80]
Reading package lists... Done
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository ' focal InRelease' is not signed.
E: Failed to fetch  506  Failure

How do I fix this?

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