sbuild-update artful-amd64                                  │
/usr/bin/sbuild-update will perform apt-get command 'update' now, however this may change at a later revi│
sion.                                                                                                    │
artful-amd64: Performing update.                                                                         │
Hit:1 http://security.ubuntu.com/ubuntu artful-security InRelease                                        │
Ign:2 http://archive.ubuntu.com/ubuntu artful InRelease                                                  │
Err:3 http://archive.ubuntu.com/ubuntu artful Release                                                    │
  500  Connection failure: Connection timed out                                                          │
Reading package lists... Done                                                                            │
E: The repository 'http://archive.ubuntu.com/ubuntu artful Release' does no longer 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.                     │
Exiting from update with status 100.