Command 'pkg-config --exists mariadb' returned non-zero exit status 127. Traceback (most recent call last):

回答: 这个问题是由于缺少`pkg-config`软件包引起的。你可以通过运行以下命令来安装它：`sudo apt-get install pkg-config`。\[3\]安装完成后，再次运行你的命令应该就不会出现这个错误了。
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