解决Ubuntu更新时一堆en_*.UTF-8

默认安装的 Ubuntu 在每次 apt 更新时都会出现一大堆 locale:

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...
Setting up locales (2.35-0ubuntu3.13) ...
Generating locales (this might take a while)...
  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_IL.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... done
  en_ZA.UTF-8... done
  en_ZM.UTF-8... done
  en_ZW.UTF-8... done
Generation complete.
...

解决办法是把 /var/lib/locales/supported.d/en 文件里的其他行删掉，只留一个 en_US.UTF-8 UTF-8。如此一来运行 locale-gen 的时候就不会等很久了。