با سلام خدمت عزیزان

روی وی پی اس kali linux نسخه گرافیکی نصب کردم. حالا وقتی میخوام vnc نصب کنم و دستور apt-get install vnc4server نمیشه و ارور زیرو میده

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package vnc4server

طبق یه آموزش که در سایت آشیانه بود kali-linux repository رو خواستم کامل کنم که ارور زیر اومد

root@kali:~# apt-get update
Err http://repo.kali.org kali-bleeding-edge Release.gpg
Could not resolve 'repo.kali.org'
Err Index of / /kali Release.gpg
Could not resolve 'http.kali.org'
Err Index of / /wheezy Release.gpg
Could not resolve 'http.kali.org'
Err Index of / kali-dev Release.gpg
Could not resolve 'http.kali.org'
Err Index of / kali Release.gpg
Could not resolve 'http.kali.org'
Err Index of / kali/updates Release.gpg
Could not resolve 'security.kali.org'
Err Publish - SourceForge all Release.gpg
Could not resolve 'downloads.sourceforge.net'
Reading package lists... Done
W: Failed to fetch http://repo.kali.org/kali/dists/kali...ge/Release.gpg Could not resolve 'repo.kali.org'

W: Failed to fetch http://http.kali.org/dists//kali/Release.gpg Could not resolve 'http.kali.org'

W: Failed to fetch http://http.kali.org/dists//wheezy/Release.gpg Could not resolve 'http.kali.org'

W: Failed to fetch http://http.kali.org/kali/dists/kali-dev/Release.gpg Could not resolve 'http.kali.org'

W: Failed to fetch http://http.kali.org/kali/dists/kali/Release.gpg Could not resolve 'http.kali.org'

W: Failed to fetch http://security.kali.org/kali-securi...es/Release.gpg Could not resolve 'security.kali.org'

W: Failed to fetch http://downloads.sourceforge.net/pro...ll/Release.gpg Could not resolve 'downloads.sourceforge.net'

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

ممنون میشم دوستانی که وارد هستن راهنمایی کنن.
با تشکر