So, the system is telling me that important updates were found, but every time I run sudo apt update I get these errors.
Err:19 http://ppa.launchpad.net/kernel-ppa/ppa/ubuntu xenial Release
404 Not Found Reading package lists... Done
W: https://download.01.org/gfx/ubuntu/16.04/main/dists/xenial/InRelease : Signature by key 09D6EF97BFB38E916EF060E756A3DEF863961D39 uses weak digest algorithm (SHA1) E: The repository 'http://ppa.launchpad.net/kernel-ppa/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.
I tried everything but couldn't find a solution, help please.