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john@john-desktop:~$ sudo apt-get install nmap

Reading package lists... Done

Building dependency tree      

Reading state information... Done

The following NEW packages will be installed:

  nmap

0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.

Need to get 1,623 kB of archives.

After this operation, 6,876 kB of additional disk space will be used.

Err http://au.archive.ubuntu.com/ubuntu/ precise/main nmap i386 5.21-1.1ubuntu1

  403  Forbidden

Failed to fetch http://au.archive.ubuntu.com/ubuntu/pool/main/n/nmap/nmap_5.21-1.1ubuntu1_i386.deb 403  Forbidden

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