apt-get warning: No support for locale: en_US.utf8

I get this error each time I update the system using apt-get. What does this error mean? Any ideas on how to correct it? (I am running Ubuntu 11.10)

Usually this error means that you could have been changing between different languages (locales) and something has caused this to error erroneously.

You could try regenerating your list of locales with

sudo dpkg-reconfigure locales

For me the result was:

Generating locales...
  en_AG.UTF-8... done
  en_AU.UTF-8... done
  en_BW.UTF-8... done
  en_CA.UTF-8... done
  en_DK.UTF-8... done
  en_GB.UTF-8... done
  en_HK.UTF-8... done
  en_IE.UTF-8... done
  en_IN.UTF-8... done
  en_NG.UTF-8... done
  en_NZ.UTF-8... done
  en_PH.UTF-8... done
  en_SG.UTF-8... done
  en_US.UTF-8... up-to-date
  en_ZA.UTF-8... done
  en_ZM.UTF-8... done
  en_ZW.UTF-8... done
Generation complete.

Then resetting your local locale with:

sudo update-locale LANG=en_US.UTF-8

i.e. use one of the Locale values in the output above

In my case, the problem was that /usr/share/initramfs-tools/hooks/root_locale is expecting to see individual locale directories in /usr/lib/locale but locale-gen is configured to generate an archive file by default.

I fixed it by running:

sudo locale-gen --purge --no-archive

The problem may come from the lower case in the "utf8" instead of "UTF8"??

Warning: No support for locale: en_US.utf8

This code seem to solve the problem.

> sudo update-locale LANG=en_US.UTF-8
> echo $LANG
en_US.UTF-8

It is also possible to go in local languages settings in theory.

Then "Apply System-Wide" should also update the local.