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W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/main/source/Sources  404  Not Found [IP: 91.189.91.26 80]
W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/restricted/source/Sources  404  Not Found [IP: 91.189.91.26 80]

Also if I can directly upgrade to any other latest version, please suggest how I can do so.

Zanna
  • 72,312
Arun
  • 1

1 Answers1

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Run sudo apt-get update to get new package information.

Note, however, that you should be able to run do-release-upgrade to jump to the max possible version of Ubuntu that the system is able to upgrade to. Sometimes, you may need to go through key steps first, but this is the most direct way to upgrade your distro.

Kaz Wolfe
  • 34,680