Fix Ubuntu Terminal Diamond Symbol

The appearance of a diamond symbol in the Ubuntu command line is usually due to mismatched character encoding. To solve this issue, you can try the following methods:

1. Set the correct character encoding: Input the following command in the command line to set the correct character encoding:

export LANG=en_US.UTF-8

1. Use a terminal that supports Unicode: If your current terminal does not support Unicode characters, you can try using another terminal that does support Unicode, such as GNOME Terminal or Konsole.
2. Update the system: make sure your Ubuntu system is up to date, as sometimes updating it can fix character encoding issues.

如果以上方法没有效果，你可以尝试手动更改终端字符编码，或者重新安装终端软件。希望这些方法能帮助你解决问题。