Laravel安装程序v1.4.1与PHP 7.1包不兼容？

Question

我不能安装'laravel 5.5'上新鲜的流行！_OS（基于Ubuntu 17.10 by system 76）安装linux。

找不到如何“删除symfony/console v4.0.1”。有人能帮我解决这个麻烦吗？

我按照这个教程https://www.youtube.com/watch?v=b38mUODC1l4，一切都很完美，直到作曲家全球需要“laravel/安装程序”命令。

输入此命令后，终端的结果是：

    Changed current directory to /home/chakra/.config/composer
Using version ^1.4 for laravel/installer
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install laravel/installer v1.4.1
    - Conclusion: remove symfony/console v4.0.1
    - Installation request for laravel/installer ^1.4 -> satisfiable by laravel/installer[v1.4.0, v1.4.1].
    - Conclusion: don't install symfony/console v4.0.1
    - laravel/installer v1.4.0 requires symfony/console ~2.3|~3.0 -> satisfiable by symfony/console[v2.3.0, ..., v3.4.1].
    - Can only install one of: symfony/console[v3.0.0, v4.0.1].
    ...
    - Can only install one of: symfony/console[v2.8.9, v4.0.1].
    - Installation request for symfony/console (locked at v4.0.1) -> satisfiable by symfony/console[v4.0.1].


Installation failed, reverting ./composer.json to its original content.
➜  Sites 

composer.json /home/chakra/.config/composer（一切都是默认的，没有像视频教程中那样改变任何东西）

后sudo纳米composer.json：

{
    "require": {
        "cpriego/valet-linux": "^2.0"
        }
}

➜  ~ which composer
/usr/local/bin/composer
➜  ~ composer --version
Composer version 1.5.5 2017-12-01 14:42:57
➜  ~ npm --version
5.5.1
➜  ~ nginx -v
nginx version: nginx/1.12.1 (Ubuntu)
➜  ~ 

Answer 1

看看https://stackoverflow.com/a/27754096 要查看已安装软件包的列表，是否有symfony/console与版本4.0.1一起列出？Lavarel安装程序明确要求v2.3或v3.x版的symfony/console，因此您可能必须首先通过composer全局删除symfony/console手动删除symfony/console

Answer 2

在尼科·哈斯的帮助下，我找到了答案。

解决这个问题的办法是：

composer全局删除cpriego/valet linux（这也将删除麻烦的symfony/console v4.0.1）删除此安装laravel后：

作曲家全局需要laravel/安装程序（它安装了所有必需的包，没有任何错误）在此重新安装代客Linux

composer全局需要cpriego/valet linux

现在一切都正常了。我可以通过laravel新应用程序创建laravel应用程序，而且代客泊车也可以正常工作。：）