Err http://security.debian.org jessie/updates InRelease

Err http://ftp.jp.debian.org jessie InRelease

Err http://ftp.jp.debian.org jessie Release.gpg
  Could not resolve 'ftp.jp.debian.org'
Err http://security.debian.org jessie/updates Release.gpg
  Could not resolve 'security.debian.org'
Err http://download.atmark-techno.com jessie InRelease

Err http://download.atmark-techno.com jessie Release.gpg
  Could not resolve 'download.atmark-techno.com'
Reading package lists... Done
W: Failed to fetch http://ftp.jp.debian.org/debian/dists/jessie/InRelease

W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease

W: Failed to fetch http://download.atmark-techno.com/debian/dists/jessie/InRelease

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

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

W: Failed to fetch http://download.atmark-techno.com/debian/dists/jessie/Release.gpg  Could not resolve 'download.atmark-techno.com'

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