I tried
sudo apt update
And got the error:
$ sudo apt update
Ign:1 http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu yakkety InRelease
Hit:2 http://archive.canonical.com/ubuntu yakkety InRelease
Ign:3 http://gb.archive.ubuntu.com/ubuntu yakkety InRelease
Err:4 http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu yakkety Release
404 Not Found
Ign:5 http://security.ubuntu.com/ubuntu yakkety-security InRelease
Ign:6 http://gb.archive.ubuntu.com/ubuntu yakkety-updates InRelease
Ign:7 http://gb.archive.ubuntu.com/ubuntu yakkety-backports InRelease
Err:8 http://security.ubuntu.com/ubuntu yakkety-security Release
404 Not Found [IP: 91.189.91.26 80]
Ign:9 http://gb.archive.ubuntu.com/ubuntu yakkety-proposed InRelease
Err:10 http://gb.archive.ubuntu.com/ubuntu yakkety Release
404 Not Found [IP: 91.189.88.161 80]
Err:11 http://gb.archive.ubuntu.com/ubuntu yakkety-updates Release
404 Not Found [IP: 91.189.88.161 80]
Err:12 http://gb.archive.ubuntu.com/ubuntu yakkety-backports Release
404 Not Found [IP: 91.189.88.161 80]
Err:13 http://gb.archive.ubuntu.com/ubuntu yakkety-proposed Release
404 Not Found [IP: 91.189.88.161 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu yakkety Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://security.ubuntu.com/ubuntu yakkety-security Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://gb.archive.ubuntu.com/ubuntu yakkety Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://gb.archive.ubuntu.com/ubuntu yakkety-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://gb.archive.ubuntu.com/ubuntu yakkety-backports Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://gb.archive.ubuntu.com/ubuntu yakkety-proposed Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
So, I tried this:
Getting following error after the commad sudo apt-get update on Ubuntu 16.04 - Stack Overflow but it didn't work. Then I tried Multiple issues with "sudo apt-get update" - Ubuntu Forums
Which now means I get this, when I try a dist upgrade from 16 to 18, via the Software Updater tool (silver circle icon): Getting following error after the commad sudo apt-get update on Ubuntu 16.04 - Stack Overflow
sudo apt update
since we don't know which "repository" has issues. Which version of Ubuntu are you using? What do you mean by silver circle icon? In the last sentence you've mentioned Which now means I get this, when I try a dist upgrade from 16 to 18, via the Software Updater tool, what do you mean by "this"?cat /etc/apt/sources.list
into a terminal and inspecting the uncommented lines (without preceding#
). Your sources should correspond to the version of Ubuntu you are using. (Ex. xenial=16.04). If you have any non-canonical or non-ubuntu sources, or if there are syntax errors in this file, it can cause problems with updates.