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Today, when executing apt-get update after adding the R language repositories to apt, I received the following erros

Err http/ppa/ubuntu/precise Sources          
  404  Not Found
Err http/ppa/ubuntu/main Sources             
  404  Not Found
Err http/ppa/ubuntu/precise i386 Packages
  404  Not Found
Err http/ppa/ubuntu/main i386 Packages       
  404  Not Found

From the paths listed, they are from the Ubuntu Precise distribution, which is a LTS version. To fix these errors, what are the replacement paths?

I found

but would like to confirm that this is the replacement path for the packages.

share|improve this question
Please edit your question to show the contents of /etc/apt/sources.list as it appears that you have malformed PPA entries, which is probably the source of the problem. – douggro Jan 26 '14 at 19:39

There are many sources available, here is a complete list of cran mirrors here:

Here is a good example of the install:

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I think you misread my question. The ppas listed are not part of CRAN, but Canonical Ubuntu itself. – Jason Jan 26 '14 at 19:02
@Jason PPAs are "Private Package Archives" and in no way "part of Canonical Ubuntu itself". Why don't you ask the maintainer of the archive? – guntbert Jan 26 '14 at 19:32

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