进入到你的flutter sdk目录中，然后找到bin/cache/lockfile文件，删除它即可。
删除之后你再运行flutter doctor，你会发现错误已经解决了。
参考：
https://blog.csdn.net/qq_26287435/article/details/89537153
Waiting for another flutter command to release the startup lock... 异常解决
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