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This question already has an answer here:

After trying to upgrade from 17.04 to 18.0 this message appears:

E: The repository 'http://ppa.launchpad.net/jonathonf/vlc/ubuntu zesty Release' does not have a Release file.
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/videolan-ubuntu-master-daily-zesty.list:2 and /etc/apt/sources.list.d/videolan-ubuntu-master-daily-zesty.list:3
E: The repository 'http://ppa.launchpad.net/videolan/stable-daily/ubuntu zesty Release' does not have a Release file.
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu zesty Release' does not have a Release file.
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu zesty-updates Release' does not have a Release file.   
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu zesty-backports Release' does not have a Release file.  
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu zesty-security Release' does not have a Release file.
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu zesty-proposed Release' does not have a Release file.

I have a netbook eMachines E350, Intel Atom processor, and 2GB RAM memory. Is it necessary to download the 18.04 ISO image?

marked as duplicate by guiverc, George Udosen, Kulfy, karel, Soren A Jan 2 at 7:09

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • There was no 2018.August (18.08) release of Ubuntu. Ubuntu 17.04's upgrade path was to 17.10, then to 18.04. Both 17.04 & 17.10 are now EOL, and after a release reaches EOL it's repositories get moved (next comment will provide information on this) which is why you get errors. I'd suggest re-installing 18.04 (particularly Xubuntu 18.04 LTS or Lubuntu 18.04 LTS as they are lighter than gnome-based Ubuntu 18.04 LTS) but you could upgrade to 17.10 then 18.04 LTS but it'd take a lot longer & more effort. – guiverc Jan 2 at 4:18
  • I would suggest sticking to LTS or Long-Term-Support releases if you don't want to upgrade every 9 months as required by non-LTS releases. Ubuntu 17.04 reached EOL back on 13-January-2018. – guiverc Jan 2 at 4:20
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First, remove reported error repository from Ubuntu Software & updates -> Other Software and try it to upgrade again.

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