Laravel Composer install failed with error in ubuntu

Question

Loading composer repositories with package information Installing dependencies (including require-dev) from lock file Your requirements could not be resolved to an installable set of packages.

Problem 1 - Installation request for aws/aws-sdk-php 3.75.0 -> satisfiable by aws/aws-sdk-php[3.75.0].

- aws/aws-sdk-php 3.75.0 requires ext-simplexml * -> the requested PHP extension simplexml is missing from your system.

Problem 2 - Installation request for erusev/parsedown 1.7.1 -> satisfiable by erusev/parsedown[1.7.1].

- erusev/parsedown 1.7.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

Problem 3 - Installation request for laravel/framework v5.5.43 -> satisfiable by laravel/framework[v5.5.43].

- laravel/framework v5.5.43 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

Problem 4 - Installation request for league/csv 9.1.4 -> satisfiable by league/csv[9.1.4].

- league/csv 9.1.4 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

Problem 5 - Installation request for nicolaslopezj/searchable 1.10.3 -> satisfiable by nicolaslopezj/searchable[1.10.3].

- nicolaslopezj/searchable 1.10.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

Problem 6 - Installation request for phpoffice/phpexcel 1.8.1 -> satisfiable by phpoffice/phpexcel[1.8.1].

- phpoffice/phpexcel 1.8.1 requires ext-xml * -> the requested PHP extension xml is missing from your system.

Problem 7 - Installation request for phar-io/manifest 1.0.1 -> satisfiable by phar-io/manifest[1.0.1].

- phar-io/manifest 1.0.1 requires ext-dom * -> the requested PHP extension dom is missing from your system.

Problem 8 - Installation request for phpunit/php-code-coverage 5.3.2 -> satisfiable by phpunit/php-code-coverage[5.3.2]. - phpunit/php-code-coverage 5.3.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.

Problem 9 - Installation request for phpunit/phpunit 6.5.13 -> satisfiable by phpunit/phpunit[6.5.13].

- phpunit/phpunit 6.5.13 requires ext-dom * -> the requested PHP extension dom is missing from your system.

Problem 10 - Installation request for theseer/tokenizer 1.1.0 -> satisfiable by theseer/tokenizer[1.1.0].

- theseer/tokenizer 1.1.0 requires ext-dom * -> the requested PHP extension dom is missing from your system.

Problem 11 - aws/aws-sdk-php 3.75.0 requires ext-simplexml * -> the requested PHP extension simplexml is missing from your system.

- league/flysystem-aws-s3-v3 1.0.21 requires aws/aws-sdk-php ^3.0.0 -> satisfiable by aws/aws-sdk-php[3.75.0].

- Installation request for league/flysystem-aws-s3-v3 1.0.21 -> satisfiable by league/flysystem-aws-s3-v3[1.0.21].

To enable extensions, verify that they are enabled in your .ini files: - /etc/php/7.2/cli/php.ini

- /etc/php/7.2/cli/conf.d/10-opcache.ini

- /etc/php/7.2/cli/conf.d/10-pdo.ini

- /etc/php/7.2/cli/conf.d/20-calendar.ini

- /etc/php/7.2/cli/conf.d/20-ctype.ini

- /etc/php/7.2/cli/conf.d/20-exif.ini

- /etc/php/7.2/cli/conf.d/20-fileinfo.ini

- /etc/php/7.2/cli/conf.d/20-ftp.ini

- /etc/php/7.2/cli/conf.d/20-gettext.ini

- /etc/php/7.2/cli/conf.d/20-iconv.ini

- /etc/php/7.2/cli/conf.d/20-json.ini

- /etc/php/7.2/cli/conf.d/20-phar.ini

- /etc/php/7.2/cli/conf.d/20-posix.ini

- /etc/php/7.2/cli/conf.d/20-readline.ini

- /etc/php/7.2/cli/conf.d/20-shmop.ini

- /etc/php/7.2/cli/conf.d/20-sockets.ini

- /etc/php/7.2/cli/conf.d/20-sysvmsg.ini

- /etc/php/7.2/cli/conf.d/20-sysvsem.ini

- /etc/php/7.2/cli/conf.d/20-sysvshm.ini

- /etc/php/7.2/cli/conf.d/20-tokenizer.ini

You can also run php --ini inside terminal to see which files are used by PHP in CLI mode.

---

What is that error means? I have all extensions mentioned above are available and enabled in my php.ini.

Answer 1

Try running:

sudo apt install php7.2-mbstring php7.2-xml

You are missing these extensions from your system and/or they are not configured to be enabled with php. This will install and enable them in your php.ini file.

Answer 2

这很有帮助，我正在使用 php8.1，用 8.1 替换 7.1 确实有效