When I try to check for updates using the update manager in the UI, I get the following error:
Code
Failed to execute command 'export LANG=C; apt-get update 2>&1': Ign file: Release.gpg Ign file: Release Ign file: Translation-en Hit http://security.debian.org wheezy/updates Release.gpg Hit http://security.debian.org wheezy/updates Release Hit http://security.debian.org wheezy/updates/main Sources Hit http://security.debian.org wheezy/updates/non-free Sources Hit http://security.debian.org wheezy/updates/main amd64 Packages Hit http://http.us.debian.org wheezy Release.gpg Hit http://security.debian.org wheezy/updates/non-free amd64 Packages Hit http://security.debian.org wheezy/updates/main Translation-en Hit http://security.debian.org wheezy/updates/non-free Translation-en Hit http://debian.linuxmint.com testing Release.gpg Hit http://ftp.us.debian.org wheezy Release.gpg Hit http://http.us.debian.org wheezy Release Hit http://debian.linuxmint.com testing Release Hit http://debian.linuxmint.com testing/main amd64 Packages Get:1 http://ftp.us.debian.org wheezy-updates Release.gpg [1554 B] Hit http://http.us.debian.org wheezy/main Sources Hit http://debian.linuxmint.com testing/non-free amd64 Packages Get:2 http://ftp.debian.org wheezy-backports Release.gpg [1554 B] Hit http://ppa.launchpad.net precise Release.gpg Hit http://http.us.debian.org wheezy/contrib Sources Hit http://ftp.us.debian.org wheezy Release Hit http://dh2k.omv-extras.org plex-wheezy-mirror Release.gpg Hit http://packages.omv-extras.org stoneburner-backports Release.gpg Hit http://http.us.debian.org wheezy/non-free Sources Get:3 http://ftp.us.debian.org wheezy-updates Release [151 kB] Hit http://download.mono-project.com wheezy Release.gpg Hit http://http.us.debian.org wheezy/main amd64 Packages Hit http://packages.openmediavault.org stoneburner Release.gpg Get:4 http://ftp.debian.org wheezy-backports Release [161 kB] Hit http://download.mono-project.com wheezy Release Hit http://ppa.launchpad.net precise Release.gpg Hit http://download.mono-project.com wheezy/main amd64 Packages Hit http://http.us.debian.org wheezy/contrib amd64 Packages Ign http://dh2k.omv-extras.org stoneburner-miller Release.gpg Ign http://download.mono-project.com wheezy/main Translation-en Hit http://packages.omv-extras.org stoneburner Release.gpg Hit http://http.us.debian.org wheezy/non-free amd64 Packages Ign http://debian.linuxmint.com testing/main Translation-en Hit http://http.us.debian.org wheezy/contrib Translation-en Ign http://debian.linuxmint.com testing/non-free Translation-en Hit http://ppa.launchpad.net precise Release Hit http://http.us.debian.org wheezy/main Translation-en Ign http://dh2k.omv-extras.org stoneburner-miller-testing Release.gpg Hit http://packages.omv-extras.org stoneburner-testing Release.gpg Hit http://http.us.debian.org wheezy/non-free Translation-en Hit http://packages.openmediavault.org stoneburner Release Hit http://ftp.us.debian.org wheezy/main Sources Ign http://shell.ninthgate.se squeeze Release.gpg Hit http://ppa.launchpad.net precise Release Hit http://ftp.us.debian.org wheezy/main amd64 Packages Ign http://dh2k.omv-extras.org stoneburner-vpn Release.gpg Hit http://packages.omv-extras.org stoneburner-plex Release.gpg Hit http://ftp.us.debian.org wheezy/main Translation-en Get:5 http://shell.ninthgate.se plexpass Release.gpg [819 B] Hit http://ppa.launchpad.net precise/main amd64 Packages Get:6 http://ftp.us.debian.org wheezy-updates/main Sources [5505 B] Hit http://dh2k.omv-extras.org plex-wheezy-mirror Release Hit http://packages.omv-extras.org stoneburner-mono Release.gpg Hit http://packages.openmediavault.org stoneburner/main amd64 Packages Get:7 http://ftp.us.debian.org wheezy-updates/non-free Sources [929 B] Hit http://ftp.debian.org wheezy-backports/main amd64 Packages/DiffIndex Hit http://ppa.launchpad.net precise/main Translation-en Ign http://shell.ninthgate.se squeeze Release Hit http://ftp.us.debian.org wheezy-updates/main amd64 Packages/DiffIndex Hit http://dh2k.omv-extras.org stoneburner-miller Release Hit http://packages.omv-extras.org stoneburner-mono-testing Release.gpg Hit http://ftp.us.debian.org wheezy-updates/non-free amd64 Packages/DiffIndex Hit http://ppa.launchpad.net precise/main Sources Hit http://ftp.debian.org wheezy-backports/contrib amd64 Packages/DiffIndex Hit http://shell.ninthgate.se plexpass Release Ign http://shell.ninthgate.se plexpass Release Hit http://ftp.us.debian.org wheezy-updates/main Translation-en/DiffIndex Hit http://dh2k.omv-extras.org stoneburner-miller-testing Release Hit http://packages.omv-extras.org stoneburner-backports Release Hit http://ftp.us.debian.org wheezy-updates/non-free Translation-en/DiffIndex Hit http://ftp.debian.org wheezy-backports/non-free amd64 Packages/DiffIndex Hit http://ppa.launchpad.net precise/main amd64 Packages Hit http://packages.omv-extras.org stoneburner Release Hit http://dh2k.omv-extras.org stoneburner-vpn Release Hit http://ftp.debian.org wheezy-backports/contrib Translation-en/DiffIndex Hit http://ppa.launchpad.net precise/main Translation-en Hit http://packages.omv-extras.org stoneburner-testing Release Hit http://dh2k.omv-extras.org plex-wheezy-mirror/main amd64 Packages Hit http://ftp.debian.org wheezy-backports/main Translation-en/DiffIndex Ign http://shell.ninthgate.se plexpass/main amd64 Packages/DiffIndex Hit http://packages.omv-extras.org stoneburner-plex Release Hit http://ftp.debian.org wheezy-backports/non-free Translation-en/DiffIndex Hit http://packages.omv-extras.org stoneburner-mono Release Ign http://dh2k.omv-extras.org stoneburner-miller/main amd64 Packages/DiffIndex Hit http://packages.omv-extras.org stoneburner-mono-testing Release Hit http://packages.omv-extras.org stoneburner-backports/main amd64 Packages Ign http://dh2k.omv-extras.org stoneburner-miller-testing/main amd64 Packages/DiffIndex Ign http://packages.openmediavault.org stoneburner/main Translation-en Hit http://packages.omv-extras.org stoneburner/main amd64 Packages Ign http://dh2k.omv-extras.org stoneburner-vpn/main amd64 Packages/DiffIndex Hit http://packages.omv-extras.org stoneburner-testing/main amd64 Packages Hit http://packages.omv-extras.org stoneburner-plex/main amd64 Packages Hit http://packages.omv-extras.org stoneburner-mono/main amd64 Packages Hit http://packages.omv-extras.org stoneburner-mono-testing/main amd64 Packages Err http://shell.ninthgate.se squeeze/main amd64 Packages 404 Not Found Ign http://shell.ninthgate.se squeeze/main Translation-en Hit http://shell.ninthgate.se plexpass/main amd64 Packages Ign http://shell.ninthgate.se plexpass/main Translation-en Ign http://dh2k.omv-extras.org plex-wheezy-mirror/main Translation-en Hit http://dh2k.omv-extras.org stoneburner-miller/main amd64 Packages Ign http://dh2k.omv-extras.org stoneburner-miller/main Translation-en Hit http://dh2k.omv-extras.org stoneburner-miller-testing/main amd64 Packages Ign http://dh2k.omv-extras.org stoneburner-miller-testing/main Translation-en Ign http://packages.omv-extras.org stoneburner-backports/main Translation-en Hit http://dh2k.omv-extras.org stoneburner-vpn/main amd64 Packages Ign http://packages.omv-extras.org stoneburner/main Translation-en Ign http://dh2k.omv-extras.org stoneburner-vpn/main Translation-en Ign http://packages.omv-extras.org stoneburner-testing/main Translation-en Ign http://packages.omv-extras.org stoneburner-plex/main Translation-en Ign http://packages.omv-extras.org stoneburner-mono/main Translation-en Ign http://packages.omv-extras.org stoneburner-mono-testing/main Translation-en Fetched 323 kB in 9s (35.8 kB/s) W: GPG error: http://shell.ninthgate.se plexpass Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0B38CE01521D8275 W: Failed to fetch http://shell.ninthgate.se/packages/debian/dists/squeeze/main/binary-amd64/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead.
Can someone help me by taking a look at the error and suggesting what I might be able to do to get rid of it?
Thanks!