Ign:1 http://rs.archive.ubuntu.com/ubuntu xenial InRelease
Ign:2 http://rs.archive.ubuntu.com/ubuntu xenial-updates InRelease
Ign:3 http://rs.archive.ubuntu.com/ubuntu xenial-backports InRelease
Ign:4 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 http://ppa.launchpad.net/cybre/elementaryplus/ubuntu xenial InRelease
Err:6 http://rs.archive.ubuntu.com/ubuntu xenial Release
  404  Not Found
Get:7 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Err:8 http://rs.archive.ubuntu.com/ubuntu xenial-updates Release
  404  Not Found
Err:9 http://rs.archive.ubuntu.com/ubuntu xenial-backports Release
  404  Not Found
Hit:10 http://ppa.launchpad.net/elementary-os/stable/ubuntu xenial InRelease
Hit:11 http://dl.google.com/linux/chrome/deb stable Release
Hit:12 http://ppa.launchpad.net/elementary-os/os-patches/ubuntu xenial InRelease
Hit:13 http://ppa.launchpad.net/philip.scott/elementary-tweaks/ubuntu xenial InRelease
Get:14 https://repo.skype.com/deb stable InRelease [4486 B]
Err:14 https://repo.skype.com/deb stable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F3045A5DF7587C3
Читам спискове пакета... Урађено
E: The repository 'http://rs.archive.ubuntu.com/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.
E: The repository 'http://rs.archive.ubuntu.com/ubuntu xenial-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://rs.archive.ubuntu.com/ubuntu xenial-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.
W: GPG грешка: https://repo.skype.com/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F3045A5DF7587C3
E: The repository 'https://repo.skype.com/deb stable InRelease' is not signed.
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.