when i try command for update, there are a lot of errors that i dont get
and when i launch software center and i type something in, its stuck on loading, how do i fix this? i started using linux todayIgn:1 http://pl.archive.ubuntu.com/ubuntu artful InRelease
Ign:2 http://pl.archive.ubuntu.com/ubuntu artful-updates InRelease
Ign:3 http://pl.archive.ubuntu.com/ubuntu artful-backports InRelease
Err:4 http://pl.archive.ubuntu.com/ubuntu artful Release
404 Not Found [IP: 153.19.251.225 80]
Err:5 http://pl.archive.ubuntu.com/ubuntu artful-updates Release
404 Not Found [IP: 153.19.251.225 80]
Err:6 http://pl.archive.ubuntu.com/ubuntu artful-backports Release
404 Not Found [IP: 153.19.251.225 80]
Ign:7 http://security.ubuntu.com/ubuntu artful-security InRelease
Err:8 http://security.ubuntu.com/ubuntu artful-security Release
404 Not Found [IP: 91.189.88.152 80]
Reading package lists... Done
E: The repository 'http://pl.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://pl.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://pl.archive.ubuntu.com/ubuntu artful-backports 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://security.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.