I'm following these instructions to install git on my laptop.

When I do:

$ sudo apt-get install git-core

This is what my terinal shows:

Reading package lists... Done

Building dependency tree        

Reading state information... Done

The following packages were automatically installed and are no longer required:   

  libasprintf0c2:i386

  libcroco3:i386

  libgettextpo0:i386

  libgomp1:i386

  libunistring0:i386

Use 'apt-get autoremove' to remove them.

The following extra packages will be installed:

  git git-man liberror-perl

Suggested packages:

  git-daemon-run

  git-daemon-sysvinit

  git-doc git-el

  git-arch git-cvs

  git-svn

  git-email

  git-gui

  gitk gitweb

The following NEW packages will be installed:

  git git-core git-man liberror-perl



 0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.

 Need to get 6,825 kB of archives. After this operation, 15.3 MB of additional disk space will be used. Do you want to continue [Y/n]? y

 WARNING: The following packages cannot be authenticated!

   liberror-perl git-man git git-core

Install these packages without verification [y/N]?

  E: Some packages could not be authenticated

lucas@lucas-Inspiron-N5050:~$ sudo apt-get install git-core

Reading package lists... Done

Building dependency tree

Reading state information... Done

The following packages were automatically installed and are no longer required:

  libasprintf0c2:i386

  libcroco3:i386

  libgettextpo0:i386

  libgomp1:i386

  libunistring0:i386

Use 'apt-get autoremove' to remove them.

The following extra packages will be installed:

  git git-man liberror-perl

Suggested packages:

  git-daemon-run git-daemon-sysvinit

  git-doc git-el git-arch git-cvs git-svn

  git-email git-gui gitk gitweb

The following NEW packages will be installed:

  git git-core

  git-man liberror-perl

 0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.

 Need to get 6,825 kB of archives. After this operation, 15.3 MB of additional disk space will be used. Do you want to continue [Y/n]? y

WARNING: The following packages cannot be authenticated!

  liberror-perl git-man git git-core

Install these packages without verification [y/N]? y

Err httpq://py.archive.ubuntu.com/ubuntu/quantal/main liberror-perl all 0.17-1

   Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

Err httpq://py.archive.ubuntu.com/ubuntu/ quantal/main git-man all 1:1.7.10.4-1ubuntu1

   Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

Err httpq://py.archive.ubuntu.com/ubuntu/ quantal/main git amd64 1:1.7.10.4-1ubuntu1

   Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

Err httpq://py.archive.ubuntu.com/ubuntu/ quantal/main git-core all 1:1.7.10.4-1ubuntu1

   Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

 Failed to fetch httpq://py.archive.ubuntu.com/ubuntu/pool/main/libe/liberror-perl/liberrorperl_0.17-1_all.deb

   Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

 Failed to fetch httpq://py.archive.ubuntu.com/ubuntu/pool/main/g/gi/git-man_1.7.10.4-1ubuntu1_all.deb

   Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

 Failed to fetch httpq://py.archive.ubuntu.com/ubuntu/pool/main/g/git/git_1.7.10.4-1ubuntu1_amd64.deb

   Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

 Failed to fetch http://py.archive.ubuntu.com/ubuntu/pool/main/g/git/git-core_1.7.10.4-1ubuntu1_all.deb

  Something wicked happened resolving 'py.archive.ubuntu.com:http' (-5 - No address associated with hostname)

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

How could I install git on Ubuntu 12.10? I can't even do it from the Ubuntu Software Center.

Thanks in advance!