After fresh installation, I run sudo apt update && sudo apt upgrade, - it doesn't look quite right to me, I'm wondering if my sources.list file is corrupt or something? Afterward I was able to upgrade a lot of packages, but I don't know if I got everything or not because I'm not sure what these errors are all about in the update process. Let me know, Thanks. $ sudo apt update Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB] Get:3 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB] Ign:4 http://ppa.launchpad.net/elementary-os/stable/ubuntu loki InRelease Ign:5 http://ppa.launchpad.net/elementary-os/os-patches/ubuntu loki InRelease Get:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB] Err:7 http://ppa.launchpad.net/elementary-os/stable/ubuntu loki Release 404 Not Found Err:8 http://ppa.launchpad.net/elementary-os/os-patches/ubuntu loki Release 404 Not Found Get:9 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [527 kB] Get:10 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [54.7 kB] Get:11 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [45.7 kB] Get:12 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [32.2 kB] Get:13 http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [37.0 kB] Get:14 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [513 kB] Get:15 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [289 kB] Get:16 http://us.archive.ubuntu.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [189 kB] Get:17 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [460 kB] Get:18 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [446 kB] Get:19 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [160 kB] Get:20 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [188 kB] Get:21 http://us.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata [2,516 B] Get:22 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 DEP-11 Metadata [3,328 B] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/elementary-os/stable/ubuntu loki 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://ppa.launchpad.net/elementary-os/os-patches/ubuntu loki 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.
