Answers for "require php ^7.1 -> your php version (8.0.17) does not satisfy that requirement. - root composer.json requires phpunit/phpunit ^7.2 -> satisfiable by phpunit/phpunit[7.2.0, ..., 7.5.20]."

laravel/ui v3.0.0 requires php ^7.3 -> your php version (8.0.2) does not satisfy that requirement.

composer install --ignore-platform-reqs

phpunit/phpunit[6.0.0, ..., 6.5.14] require php ^7.0 -> your php version (8.0.0) does not satisfy that requirement.

- phpunit/phpunit 5.5.4 requires php ^5.6 || ^7.0 -> your PHP version (7.0.26-2+ubuntu16.04.1+deb.sury.org+2) overridden by "config.platform.php" version (5.5) does not satisfy that requirement.