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sudo apt-get install  language-pack-ja-baseReading package lists... Done

Building dependency tree      

Reading state information... Done

Package language-pack-ja-base 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

However the following packages replace it:

  language-pack-ja-base

 

E: Package 'language-pack-ja-base' has no installation candidate