Дополнение инструкции по установке

[valsha]

перед

Generate a new application key

php artisan key:generate

надо наверно добавить

sudo composer install --ignore-platform-reqs

потому что

sudo composer update --no-scripts

не работает, из за

- phpunit/phpunit 8.5.x-dev requires ext-dom * -> the requested PHP extension dom is missing from your system.

хоть у вас и указано в composer.json

"require": {
    "^7.2.5|^7.3|^8.0",
    .....
},

[BuyOwnEx]

Please check the official laravel 7.x installation guide for server requirements before you start. Official Documentation

In this official documentation you can see server requirements such as:

PHP >= 7.2.5 BCMath PHP Extension Ctype PHP Extension Fileinfo PHP extension JSON PHP Extension Mbstring PHP Extension OpenSSL PHP Extension PDO PHP Extension Tokenizer PHP Extension XML PHP Extension

The last one includes ext-dom

[valsha]

Ну 7я версия Laravel работает без проблем и с 8 версией PHP с учетом даже того что в том же composer.json указано "^7.2.5|^7.3|^8.0",

[BuyOwnEx]

I will check for installation with php v. 8.0 The error phpunit/phpunit 8.5.x-dev requires ext-dom * -> the requested PHP extension dom is missing from your system. tell us simply install dom php Extension, right?

[valsha]

yes, php extension is installed. the problem is here i think - phpunit/phpunit 8.5.9 requires php ^7.2 -> your PHP version (8.0.7) does not satisfy that requirement.

[BuyOwnEx]

Yes, will add

sudo composer install --ignore-platform-reqs

but only, I guess, for php v. 8.0