This is because the PPA you are trying to access does not have any
information for xenial (or any release newer than that):
http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu/dists/.
Unfortunately you will just need to disable this PPA.
** Changed in: apt (Ubuntu)
Status: New => Invalid
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Touch seeded packages, which is subscribed to apt in Ubuntu.
https://bugs.launchpad.net/bugs/1988591
Title:
apt update fails with ` 404 Not Found [IP: 185.125.190.52 80]`
Status in apt package in Ubuntu:
Invalid
Bug description:
sudo apt update
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:5 http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu xenial
InRelease
Hit:6 http://ppa.launchpad.net/yubico/stable/ubuntu xenial InRelease
Err:7 http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu xenial
Release
404 Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/takluyver/matplotlib-daily/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.
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https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1988591/+subscriptions
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