composer unable to install laravel/passport

Question

I have created a new project with

laravel new blogposts

using "Laravel Installer 2.0.1" globally installed on my ubuntu 18.

When i trying to install passport using

composer require laravel/passport

following errors are their

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, v2.0.1, 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 v2.2.0 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].
- 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].

Installation failed, reverting ./composer.json to its original content. Any help will be appreciated. Thanks.

Answer 1

This link may help you https://github.com/laravel/passport/issues/774

They said, it fixed their issue

composer require paragonie/random_compat:2.*
composer require laravel/passport

Answer 2

Same issue with Laravel 5.5.40 or higher. So you need to specify the version of the passport like this;

composer require paragonie/random_compat:2.*
composer require laravel/passport=~4.0