Ubuntu 16.04升級系統遇到ascii codec錯誤

舊的Ubuntu 16.04 LTS要用do-release-upgrade指令將系統升級到18.04 LTS的時候，出現看起來就是locale字集的設定錯誤：

Traceback (most recent call last):
  File "/usr/bin/do-release-upgrade", line 123, in <module>
    print(_("Checking for a new Ubuntu release"))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-6: ordinal not in range(128) 

參考了Error upgrading to 13.04, "'ascii' codec can't encode character "一文後，依序用下列的指令就可以順利將Ubuntu從16.04升級到18.04惹：

1. sudo apt update -y && sudo apt upgrade -y
2. sudo reboot，等重開機後再做下面的指令
3. sudo ufw allow 1022/tcp
4. LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8 
5. sudo do-release-upgrade

參考資料

• Ubuntu 16.04用ESM做安全性更新：在更新套件出問題可參考這篇
• How to upgrade Ubuntu 16.04 to 18.04 LTS using CLI：升級主要看這篇
• locale@Ubuntu 18.04探索筆記：設定英文介面

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