Ign:1 http://archive.ubuntu.com/ubuntu artful InRelease
Ign:2 http://archive.ubuntu.com/ubuntu artful-updates InRelease
Ign:3 http://archive.ubuntu.com/ubuntu artful-security InRelease
Err:4 http://archive.ubuntu.com/ubuntu artful Release
  404  Not Found [IP: 2001:67c:1560:8001::11 80]
Err:5 http://archive.ubuntu.com/ubuntu artful-updates Release
  404  Not Found [IP: 2001:67c:1560:8001::11 80]
Err:6 http://archive.ubuntu.com/ubuntu artful-security Release
  404  Not Found [IP: 2001:67c:1560:8001::11 80]
Reading package lists... Done
E: The repository 'http://archive.ubuntu.com/ubuntu artful 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.
E: The repository 'http://archive.ubuntu.com/ubuntu artful-updates 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.
E: The repository 'http://archive.ubuntu.com/ubuntu artful-security 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.