apt-get update not working and i can't add any repositories - Ask Ubuntu


guys please sudo apt-get update isn't working , can't add repositories,thanks.

hashik@hashik:~$ sudo apt-get update [sudo] password hashik:  err:1 http://in.archive.ubuntu.com/ubuntu yakkety inrelease   not resolve 'in.archive.ubuntu.com' err:2 http://security.ubuntu.com/ubuntu yakkety-security inrelease   not resolve 'security.ubuntu.com' err:3 http://ppa.launchpad.net/noobslab/apps/ubuntu yakkety inrelease   not resolve 'ppa.launchpad.net' err:4 http://in.archive.ubuntu.com/ubuntu yakkety-updates inrelease   not resolve 'in.archive.ub        hashik@hashik:~$ sudo apt-get update [sudo] password hashik:  err:1 http://in.archive.ubuntu.com/ubuntu yakkety inrelease   not resolve 'in.archive.ubuntu.com' err:2 http://security.ubuntu.com/ubuntu yakkety-security inrelease   not resolve 'security.ubuntu.com' err:3 http://ppa.launchpad.net/noobslab/apps/ubuntu yakkety inrelease   not resolve 'ppa.launchpad.net' err:4 http://in.archive.ubuntu.com/ubuntu yakkety-updates inrelease   not resolve 'in.archive.ubuntu.com' err:5 http://in.archive.ubuntu.com/ubuntu yakkety-backports inrelease   not resolve 'in.archive.ubuntu.com' reading package lists... done w: failed fetch http://in.archive.ubuntu.com/ubuntu/dists/yakkety/inrelease  not resolve 'in.archive.ubuntu.com' w: failed fetch http://in.archive.ubuntu.com/ubuntu/dists/yakkety-updates/inrelease  not resolve 'in.archive.ubuntu.com' w: failed fetch http://in.archive.ubuntu.com/ubuntu/dists/yakkety-backports/inrelease  not resolve 'in.archive.ubuntu.com' w: failed fetch http://security.ubuntu.com/ubuntu/dists/yakkety-security/inrelease  not resolve 'security.ubuntu.com' w: failed fetch http://ppa.launchpad.net/noobslab/apps/ubuntu/dists/yakkety/inrelease  not resolve 'ppa.launchpad.net' w: index files failed download. have been ignored, or old ones used instead.untu.com' err:5 http://in.archive.ubuntu.com/ubuntu yakkety-backports inrelease   not resolve 'in.archive.ubuntu.com' reading package lists... done w: failed fetch http://in.archive.ubuntu.com/ubuntu/dists/yakkety/inrelease  not resolve 'in.archive.ubuntu.com' w: failed fetch http://in.archive.ubuntu.com/ubuntu/dists/yakkety-updates/inrelease  not resolve 'in.archive.ubuntu.com' w: failed fetch http://in.archive.ubuntu.com/ubuntu/dists/yakkety-backports/inrelease  not resolve 'in.archive.ubuntu.com' w: failed fetch http://security.ubuntu.com/ubuntu/dists/yakkety-security/inrelease  not resolve 'security.ubuntu.com' w: failed fetch http://ppa.launchpad.net/noobslab/apps/ubuntu/dists/yakkety/inrelease  not resolve 'ppa.launchpad.net' w: index files failed download. have been ignored, or old ones used instead. 


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