提问前请务必仔细阅读如何排查故障和常见问题。
问题描述：
Package swiftmailer/swiftmailer is abandoned, you should avoid using it. Use symfony/mailer instead.
Generating autoload files
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每次安装完扩展也会有这个，我翻译了一下说是某个包被废弃了。我应该如何更换这个东西呢？
我使用的是ubuntu