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This question already has an answer here:

Err:17 http://ppa.launchpad.net/neizod/ppa/ubuntu xenial Release
404 Not Found Reading package lists... Done

E: The repository 'http://ppa.launchpad.net/neizod/ppa/ubuntu xenial 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.

marked as duplicate by karel, vidarlo, dobey, user535733, Kevin Bowen Jun 27 '18 at 21:03

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3

The neizod ppa I found, supports saucy only. Not xenial. If you used:

sudo add-apt-repository ppa:neizod/ppa

to add that ppa, you should use

sudo add-apt-repository --remove ppa:neizod/ppa

to remove it since it's useless on Xenial.

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