apt-get не работает на Ubuntu VPS

Я не смог установить какое-либо программное обеспечение с помощью команды apt-get в моем VPS, и терминал печатает:

root@ubuntu:~# apt-get install python3
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python3 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python3' has no installation candidate

В чем проблема? Я попробовал apt-get update от имени пользователя root, и вот что мне показано:

root@ubuntu:~# apt-get update
Err http://security.ubuntu.com precise-security Release.gpg
  Temporary failure resolving 'security.ubuntu.com'
Err http://us.archive.ubuntu.com precise Release.gpg
  Temporary failure resolving 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com precise-updates Release.gpg
  Temporary failure resolving 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com precise-backports Release.gpg
  Temporary failure resolving 'us.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg  Temporary failure resolving 'security.ubuntu.com'

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

И мой VPS место находится в Германии. Имеет ли это значение?