composer-php - Composer 的“您的要求无法解决”消息告诉我什么？
问题描述
我正在尝试从用于我的开发环境的 docker 容器中composer require安装一些模块，但我收到一条我不理解的错误消息。drupal我在网上查找了文档，但那里的大多数资源似乎都是关于如何解决依赖问题的，但我对理解错误消息本身更感兴趣，所以我无法在一般情况下解决这个问题。
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> [18/19] RUN composer require -n drupal/devel:4.0.1 drupal/console:1.9.4:
#22 0.260 Do not run Composer as root/super user! See https://getcomposer.org/root for details
#22 19.18 ./composer.json has been updated
#22 19.24 Loading composer repositories with package information
#22 20.31 Updating dependencies (including require-dev)
#22 37.86 Your requirements could not be resolved to an installable set of packages.
#22 37.86
#22 37.86 Problem 1
#22 37.86 - drupal/console 1.9.4 requires drupal/console-core 1.9.4 -> satisfiable by drupal/console-core[1.9.4].
#22 37.86 - Installation request for drupal/console 1.9.4 -> satisfiable by drupal/console[1.9.4].
#22 37.86 - Conclusion: remove symfony/console v4.4.9
#22 37.86 - Conclusion: don't install symfony/console v4.4.9
#22 37.86 - drupal/console-core 1.9.4 requires symfony/event-dispatcher ~2.8|~3.0 -> satisfiable by symfony/event-dispatcher[2.8.x-dev, 3.0.x-dev, 3.1.x-dev, 3.2.x-dev, 3.3.x-dev, 3.4.x-dev, v2.8.0, v2.8.0-BETA1, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v2.8.14, v2.8.15, v2.8.16, v2.8.17, v2.8.18, v2.8.19, v2.8.2, v2.8.20, v2.8.21, v2.8.22, v2.8.23, v2.8.24, v2.8.25, v2.8.26, v2.8.27, v2.8.28, v2.8.29, v2.8.3, v2.8.30, v2.8.31, v2.8.32, v2.8.33, v2.8.34, v2.8.35, v2.8.36, v2.8.37, v2.8.38, v2.8.39, v2.8.4, v2.8.40, v2.8.41, v2.8.42, v2.8.43, v2.8.44, v2.8.45, v2.8.46, v2.8.47, v2.8.48, v2.8.49, v2.8.5, v2.8.50, v2.8.52, v2.8.6, v2.8.7, v2.8.8, v2.8.9, v3.0.0, v3.0.0-BETA1, v3.0.1, v3.0.2, v3.0.3, v3.0.4, v3.0.5, v3.0.6, v3.0.7, v3.0.8, v3.0.9, v3.1.0, v3.1.0-BETA1, v3.1.0-RC1, v3.1.1, v3.1.10, v3.1.2, v3.1.3, v3.1.4, v3.1.5, v3.1.6, v3.1.7, v3.1.8, v3.1.9, v3.2.0, v3.2.0-BETA1, v3.2.0-RC1, v3.2.0-RC2, v3.2.1, v3.2.10, v3.2.11, v3.2.12, v3.2.13, v3.2.14, v3.2.2, v3.2.3, v3.2.4, v3.2.5, v3.2.6, v3.2.7, v3.2.8, v3.2.9, v3.3.0, v3.3.0-BETA1, v3.3.0-RC1, v3.3.1, v3.3.10, v3.3.11, v3.3.12, v3.3.13, v3.3.14, v3.3.15, v3.3.16, v3.3.17, v3.3.18, v3.3.2, v3.3.3, v3.3.4, v3.3.5, v3.3.6, v3.3.7, v3.3.8, v3.3.9, v3.4.0, v3.4.0-BETA1, v3.4.0-BETA2, v3.4.0-BETA3, v3.4.0-BETA4, v3.4.0-RC1, v3.4.0-RC2, v3.4.1, v3.4.10, v3.4.11, v3.4.12, v3.4.13, v3.4.14, v3.4.15, v3.4.16, v3.4.17, v3.4.18, v3.4.19, v3.4.2, v3.4.20, v3.4.21, v3.4.22, v3.4.23, v3.4.24, v3.4.25, v3.4.26, v3.4.27, v3.4.28, v3.4.29, v3.4.3, v3.4.30, v3.4.31, v3.4.32, v3.4.33, v3.4.34, v3.4.35, v3.4.36, v3.4.37, v3.4.38, v3.4.39, v3.4.4, v3.4.40, v3.4.41, v3.4.42, v3.4.43, v3.4.44, v3.4.45, v3.4.5, v3.4.6, v3.4.7, v3.4.8, v3.4.9].
#22 37.86 - symfony/event-dispatcher 2.8.x-dev conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.0 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.0-BETA1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.10 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.11 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.12 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.13 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.14 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.15 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.16 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.17 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.18 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.19 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.20 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.21 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.22 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.23 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.24 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.25 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.26 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.27 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.28 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v2.8.29 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v2.8.3 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v2.8.30 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v2.8.31 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v2.8.32 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v2.8.33 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.34 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.35 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.36 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.37 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.38 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.39 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.4 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.40 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.41 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.42 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.43 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.44 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.45 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.46 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.47 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.48 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.49 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.5 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.50 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.52 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.6 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.7 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.8 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v2.8.9 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher 3.0.x-dev conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.0.0 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.0.0-BETA1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.0.1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.0.2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.0.3 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.0.4 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.0.5 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.0.6 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.0.7 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.0.8 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.0.9 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher 3.1.x-dev conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher 3.2.x-dev conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher 3.3.x-dev conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher 3.4.x-dev conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.0 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.0-BETA1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.0-RC1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.10 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.3 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.4 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.5 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.6 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.7 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.8 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.1.9 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.0 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.0-BETA1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.0-RC1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.0-RC2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.10 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.11 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.12 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.13 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.2.14 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.2.2 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.2.3 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.2.4 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.2.5 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.2.6 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.7 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.8 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.2.9 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.0 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.0-BETA1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.0-RC1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.10 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.11 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.12 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.13 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.14 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.15 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.16 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.17 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.18 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.3 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.4 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.5 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.6 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.7 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.8 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.3.9 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.0 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.0-BETA1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.0-BETA2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.0-BETA3 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.0-BETA4 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.0-RC1 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.0-RC2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.1 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.10 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.11 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.12 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.13 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.14 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.15 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.16 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.17 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.18 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.19 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.2 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.20 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.21 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.22 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.23 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.24 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.25 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.26 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.27 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.28 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.29 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.3 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.30 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.31 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.32 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.33 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.34 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.35 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.36 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.37 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.38 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.39 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.4 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.40 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.41 conflicts with symfony/console[v4.4.9]. #22 37.86 - symfony/event-dispatcher v3.4.42 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.43 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.44 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.45 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.5 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.6 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.7 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.8 conflicts with symfony/console[v4.4.9].
#22 37.86 - symfony/event-dispatcher v3.4.9 conflicts with symfony/console[v4.4.9].
#22 37.86 - Installation request for symfony/console (locked at v4.4.9) -> satisfiable by symfony/console[v4.4.9].
#22 37.86
#22 38.40
#22 38.40 Installation failed, reverting ./composer.json to its original content.
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到目前为止，这是我的理解；
#22 37.86 - drupal/console 1.9.4 需要 drupal/console-core 1.9.4 -> 可由 drupal/console-core[1.9.4] 满足。#22 37.86 - drupal/console 1.9.4 的安装请求 -> drupal/console [1.9.4] 可满足。
我告诉作曲家安装drupal/console:1.9.4，它找到了一个完全匹配的版本。
#22 37.86 - 结论：删除 symfony/console v4.4.9 #22 37.86 - 结论：不要安装 symfony/console v4.4.9
我不确定，但我认为也许作曲家认为这与它drupal/console相同symfony/console，因此必须symfony/console:4.4.9在安装之前将其删除drupal/console:1.9.4？
然后有很多行symfony/event-dispatcher vx.x.x conflicts with symfony/console[vx.x.x].我真的不明白其中的含义。
- symfony/console 的安装请求（锁定在 v4.4.9）-> 可由 symfony/console[v4.4.9] 满足。
我认为这只是告诉我，满足symfony/console:4.4.9要求的唯一方法是安装该确切版本，它先前已决定（出于某种原因）不安装该版本。
我不明白冲突在哪里。是因为symfony/console和drupal/console不兼容吗？为什么？
解决方案
drupal/console-core 1.9.4 requires symfony/event-dispatcher ~2.8|~3.0
以及 symfony/event-dispatcher 的每一个令人满意的版本conflicts with symfony/console[v4.4.9]
更改 symfony/console 的版本限制或先将其删除，否则，您将无法安装 drupal/console 1.9.4。
如果你必须有 symfony/console v4.4.9 那么你需要找到一个不同版本的 drupal/console。您可以尝试通过不指定版本来让 composer 找到兼容的版本：
composer require drupal/console
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