# sudo apt-get update
sudo: unable to resolve host ubuntu
Err http://security.debian.org testing/updates InRelease

Err http://ftp.pl.debian.org testing InRelease

Err http://www.debian-multimedia.org testing InRelease
  # sudo apt-get update
sudo: unable to resolve host ubuntu
Err http://security.debian.org testing/updates InRelease

Err http://ftp.pl.debian.org testing InRelease

Err http://www.debian-multimedia.org testing InRelease

Err http://deb.opera.com testing InRelease

Err http://dl.google.com stable InRelease

Err http://mozilla.debian.net wheezy InRelease

Err http://deb.playonlinux.com squeeze InRelease

Err http://security.debian.org testing/updates Release.gpg
  Could not resolve 'security.debian.org'
Err http://ftp.pl.debian.org testing Release.gpg
  Could not resolve 'ftp.pl.debian.org'
Err http://www.debian-multimedia.org testing Release.gpg
  Could not resolve 'www.debian-multimedia.org'
Err http://deb.opera.com testing Release.gpg
  Could not resolve 'deb.opera.com'
Err http://dl.google.com stable Release.gpg
  Could not resolve 'dl.google.com'
Err http://mozilla.debian.net wheezy Release.gpg
  Could not resolve 'mozilla.debian.net'
Err http://deb.playonlinux.com squeeze Release.gpg
  Could not resolve 'deb.playonlinux.com'
Reading package lists... Done
W: Failed to fetch http://security.debian.org/dists/testing/updates/InRelease

W: Failed to fetch http://ftp.pl.debian.org/debian/dists/testing/InRelease

W: Failed to fetch http://www.debian-multimedia.org/dists/testing/InRelease

W: Failed to fetch http://deb.opera.com/opera/dists/testing/InRelease

W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/InRelease

W: Failed to fetch http://mozilla.debian.net/dists/wheezy/InRelease

W: Failed to fetch http://deb.playonlinux.com/dists/squeeze/InRelease

W: Failed to fetch http://security.debian.org/dists/testing/updates/Release.gpg  Could not resolve 'security.debian.org'

W: Failed to fetch http://ftp.pl.debian.org/debian/dists/testing/Release.gpg  Could not resolve 'ftp.pl.debian.org'

W: Failed to fetch http://www.debian-multimedia.org/dists/testing/Release.gpg  Could not resolve 'www.debian-multimedia.org'

W: Failed to fetch http://deb.opera.com/opera/dists/testing/Release.gpg  Could not resolve 'deb.opera.com'

W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg  Could not resolve 'dl.google.com'

W: Failed to fetch http://mozilla.debian.net/dists/wheezy/Release.gpg  Could not resolve 'mozilla.debian.net'

W: Failed to fetch http://deb.playonlinux.com/dists/squeeze/Release.gpg  Could not resolve 'deb.playonlinux.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.
#

Err http://deb.opera.com testing InRelease

Err http://dl.google.com stable InRelease

Err http://mozilla.debian.net wheezy InRelease

Err http://deb.playonlinux.com squeeze InRelease

Err http://security.debian.org testing/updates Release.gpg
  Could not resolve 'security.debian.org'
Err http://ftp.pl.debian.org testing Release.gpg
  Could not resolve 'ftp.pl.debian.org'
Err http://www.debian-multimedia.org testing Release.gpg
  Could not resolve 'www.debian-multimedia.org'
Err http://deb.opera.com testing Release.gpg
  Could not resolve 'deb.opera.com'
Err http://dl.google.com stable Release.gpg
  Could not resolve 'dl.google.com'
Err http://mozilla.debian.net wheezy Release.gpg
  Could not resolve 'mozilla.debian.net'
Err http://deb.playonlinux.com squeeze Release.gpg
  Could not resolve 'deb.playonlinux.com'
Reading package lists... Done
W: Failed to fetch http://security.debian.org/dists/testing/updates/InRelease

W: Failed to fetch http://ftp.pl.debian.org/debian/dists/testing/InRelease

W: Failed to fetch http://www.debian-multimedia.org/dists/testing/InRelease

W: Failed to fetch http://deb.opera.com/opera/dists/testing/InRelease

W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/InRelease

W: Failed to fetch http://mozilla.debian.net/dists/wheezy/InRelease

W: Failed to fetch http://deb.playonlinux.com/dists/squeeze/InRelease

W: Failed to fetch http://security.debian.org/dists/testing/updates/Release.gpg  Could not resolve 'security.debian.org'

W: Failed to fetch http://ftp.pl.debian.org/debian/dists/testing/Release.gpg  Could not resolve 'ftp.pl.debian.org'

W: Failed to fetch http://www.debian-multimedia.org/dists/testing/Release.gpg  Could not resolve 'www.debian-multimedia.org'

W: Failed to fetch http://deb.opera.com/opera/dists/testing/Release.gpg  Could not resolve 'deb.opera.com'

W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg  Could not resolve 'dl.google.com'

W: Failed to fetch http://mozilla.debian.net/dists/wheezy/Release.gpg  Could not resolve 'mozilla.debian.net'

W: Failed to fetch http://deb.playonlinux.com/dists/squeeze/Release.gpg  Could not resolve 'deb.playonlinux.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.
#