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
# 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 http://archive.ubuntu.com/ubuntu focal universe # deb-src http://za.archive.ubuntu.com/ubuntu/ focal universe deb http://archive.ubuntu.com/ubuntu focal-updates universe # deb-src http://za.archive.ubuntu.com/ubuntu/ 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 http://archive.canonical.com/ubuntu focal partner # deb-src http://archive.canonical.com/ubuntu 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 http://archive.ubuntu.com/ubuntu focal InRelease 506 Failure To Connect To Web Server [IP: 126.96.36.199 80] Err:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease 506 Failure To Connect To Web Server [IP: 188.8.131.52 80] Err:3 http://archive.ubuntu.com/ubuntu focal-backports InRelease 506 Failure To Connect To Web Server [IP: 184.108.40.206 80] Err:4 http://archive.ubuntu.com/ubuntu focal-security InRelease 506 Failure To Connect To Web Server [IP: 220.127.116.11 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 'http://archive.ubuntu.com/ubuntu focal InRelease' is not signed. E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal/InRelease 506 Failure
How do I fix this?