报错
PS C:\Users\Administrator> flutter pub
Building flutter tool...
Running pub upgrade...
Because flutter_tools depends on built_collection 4.3.2 which doesn't match any versions, version solving failed.
Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)
等待 0 秒，按 CTRL+C 退出 ...
Running pub upgrade...
Because flutter_tools depends on built_collection 4.3.2 which doesn't match any versions, version solving failed.
Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (8 tries left)
等待 0 秒，按 CTRL+C 退出 ...
起因
时隔许久给新电脑装Flutter环境，git clone flutter，配置环境变量
后运行fluttter doctor报错
分析
Flutter 安装过程中使用了国内镜像
但是Flutter是拉的官方的git
但是pub镜像没有及时更新，导致flutter_tools 的依赖找不到最新的版本
解决方法
暂时删除PUB_HOSTED_URL
使用代理setx https_proxy 127.0.0.1:1080
或者
查看下最后Sync时间
PUB_HOSTED_URL更换其他镜像
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