php – composer无法安装laravel / passport

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使用全局安装在我的ubuntu 18上的“Laravel Installer 2.0.1”.

当我尝试使用安装护照

composer require laravel/passport

以下错误是他们的

Using version ^6.0 for laravel/passport
./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/passport v6.0.6

- Conclusion: don't install laravel/passport v6.0.5
- Conclusion: don't install laravel/passport v6.0.4
- Conclusion: don't install laravel/passport v6.0.3
- Conclusion: don't install laravel/passport v6.0.2
- Conclusion: don't install laravel/passport v6.0.1
- Conclusion: don't install laravel/passport v6.0.0
- Conclusion: don't install laravel/passport 6.0.x-dev
- Conclusion: remove paragonie/random_compat v9.99.99
- Installation request for laravel/passport ^6.0 -> satisfiable by laravel/passport[6.0.x-dev,v6.0.0,v6.0.1,v6.0.2,v6.0.3,v6.0.4,v6.0.5,v6.0.6].
- Conclusion: don't install paragonie/random_compat v9.99.99
- laravel/passport 6.0.x-dev requires league/oauth2-server ^7.0 -> satisfiable by league/oauth2-server[7.0.0,7.1.0,7.1.1,7.2.0].
- league/oauth2-server 7.1.0 requires defuse/php-encryption ^2.1 -> satisfiable by defuse/php-encryption[v2.1.0,v2.2.0].
- league/oauth2-server 7.1.1 requires defuse/php-encryption ^2.1 -> satisfiable by defuse/php-encryption[v2.1.0,v2.2.0].
- league/oauth2-server 7.2.0 requires defuse/php-encryption ^2.1 -> satisfiable by defuse/php-encryption[v2.1.0,v2.2.0].
- league/oauth2-server 7.0.0 requires paragonie/random_compat ^2.0 -> satisfiable by paragonie/random_compat[v2.0.0,v2.0.1,v2.0.10,v2.0.11,v2.0.12,v2.0.13,v2.0.14,v2.0.15,v2.0.16,v2.0.17,v2.0.2,v2.0.3,v2.0.4,v2.0.5,v2.0.6,v2.0.7,v2.0.8,v2.0.9].
- defuse/php-encryption v2.1.0 requires paragonie/random_compat ~2.0 -> satisfiable by paragonie/random_compat[v2.0.0,v2.0.9].
- defuse/php-encryption v2.2.0 requires paragonie/random_compat ~2.0 -> satisfiable by paragonie/random_compat[v2.0.0,v2.0.9].
- Can only install one of: paragonie/random_compat[v2.0.0,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.1,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.10,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.11,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.12,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.13,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.14,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.15,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.16,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.17,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.2,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.3,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.4,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.5,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.6,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.7,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.8,v9.99.99].
- Can only install one of: paragonie/random_compat[v2.0.9,v9.99.99].
- Installation request for paragonie/random_compat (locked at v9.99.99) -> satisfiable by paragonie/random_compat[v9.99.99].

安装失败,将./composer.json恢复为原始内容.
任何帮助将不胜感激.谢谢.