ADD:
root@ip-172-31-15-21:/# apt-get update
Hit:1 http://security.ubuntu.com/ubuntu precise-security InRelease
Ign:2 http://archive.ubuntu.com/ubuntu precise InRelease
Ign:3 http://extras.ubuntu.com/ubuntu precise InRelease
Hit:4 http://archive.ubuntu.com/ubuntu precise Release
Hit:6 http://extras.ubuntu.com/ubuntu precise Release
Ign:7 http://archive.canonical.com/ubuntu precise InRelease
Get:8 http://extras.ubuntu.com/ubuntu precise Release.gpg [72 B]
Ign:8 http://extras.ubuntu.com/ubuntu precise Release.gpg
Hit:9 http://archive.canonical.com/ubuntu precise Release
Ign:11 http://it.archive.ubuntu.com/ubuntu precise InRelease
Hit:12 http://it.archive.ubuntu.com/ubuntu precise-updates InRelease
Hit:13 http://it.archive.ubuntu.com/ubuntu precise Release
Fetched 72 B in 2s (25 B/s)
Reading package lists... Done
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Packages (restricted/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (restricted/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: http://security.ubuntu.com/ubuntu/dists/precise-security/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://archive.ubuntu.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: GPG error: http://extras.ubuntu.com/ubuntu precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
W: The repository 'http://extras.ubuntu.com/ubuntu precise Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: http://archive.canonical.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://it.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://it.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Packages (restricted/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (restricted/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:6