Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://archive.canonical.com/ubuntu bionic InRelease
Hit:3 http://repos.del.extreme-ix.org/ubuntu bionic InRelease
Hit:4 http://repos.del.extreme-ix.org/ubuntu bionic-updates InRelease
Hit:5 http://repos.del.extreme-ix.org/ubuntu bionic-backports InRelease
Hit:6 http://repos.del.extreme-ix.org/ubuntu bionic-security InRelease
Hit:7 http://ppa.launchpad.net/git-core/ppa/ubuntu bionic InRelease
Hit:8 http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic InRelease
Hit:9 https://packages.microsoft.com/repos/vscode stable InRelease
Ign:10 http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu bionic InRelease
Err:11 http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu bionic Release
404 Not Found [IP: **.***.**.** 80]
Reading package lists... Done
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
E: The repository 'http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu bionic 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.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/vscode.list:3
sudo apt upgrade
works fine.
I have tried Select Best Server in Software and Update but it did not work.
I have also tried the solution from this page: apt- sudo apt-get update not working!
Please help. Thank you in advance.
sudo
access on your system, added it but support for it ended with 17.04 thus it should not have been added; It needs removal,, and possibly replacing with a source which provide bionic/18.04 support if required by users. PPA's are 3rd party so responsibility on fitness for purpose, trustworthy & good for your system are all on you.sudo
rights) added them, eg. /etc/apt/sources.list.d/vscode.list contains records also found in the main sources.list The /etc/apt/sources.list.d/ directory is empty on a new install, so those were added post-install without check to see if already added (those entries someone also added to /etc/apt/sources.list file too). I'd delete the extra entries added to /etc/apt/sources.list myself (vscode
isn't a Ubuntu entry so belongs in sources.list.d in my opinion) but which you delete is up to you. help.ubuntu.com/community/Repositories/Ubuntu