Cấu hình của Lampp php

Question

Hệ điều hành: Ubuntu 17.10
Tôi đã cài đặt LAMPP và Laravel. và khi tôi cố gắng composer install tôi bị lỗi

- 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 2 
    - Installation request for phpunit/php-code-coverage 5.2.2 -> satisfiable by phpunit/php-code-coverage[5.2.2]. 
    - phpunit/php-code-coverage 5.2.2 requires ext-dom * -> the requested PHP extension dom is missing from your system. 
    Problem 3 
    - Installation request for phpunit/phpunit 6.4.3 -> satisfiable by phpunit/phpunit[6.4.3]. 
    - phpunit/phpunit 6.4.3 requires ext-dom * -> the requested PHP extension dom is missing from your system. 
    Problem 4 
    - 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. 

    To enable extensions, verify that they are enabled in your .ini files: 
    - /etc/php/7.1/cli/php.ini 
    - /etc/php/7.1/cli/conf.d/10-opcache.ini 
    - /etc/php/7.1/cli/conf.d/10-pdo.ini 
    - /etc/php/7.1/cli/conf.d/20-calendar.ini 
    - /etc/php/7.1/cli/conf.d/20-ctype.ini 
    - /etc/php/7.1/cli/conf.d/20-exif.ini 
    - /etc/php/7.1/cli/conf.d/20-fileinfo.ini 
    - /etc/php/7.1/cli/conf.d/20-ftp.ini 
    - /etc/php/7.1/cli/conf.d/20-gettext.ini 
    - /etc/php/7.1/cli/conf.d/20-iconv.ini 
    - /etc/php/7.1/cli/conf.d/20-json.ini 
    - /etc/php/7.1/cli/conf.d/20-mbstring.ini 
    - /etc/php/7.1/cli/conf.d/20-pdo.ini 
    - /etc/php/7.1/cli/conf.d/20-phar.ini 
    - /etc/php/7.1/cli/conf.d/20-posix.ini 
    - /etc/php/7.1/cli/conf.d/20-readline.ini 
    - /etc/php/7.1/cli/conf.d/20-shmop.ini 
    - /etc/php/7.1/cli/conf.d/20-sockets.ini 
    - /etc/php/7.1/cli/conf.d/20-sysvmsg.ini 
    - /etc/php/7.1/cli/conf.d/20-sysvsem.ini 
    - /etc/php/7.1/cli/conf.d/20-sysvshm.ini 
    - /etc/php/7.1/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. 

sau tôi kiểm tra lại file tất cả các phần mở rộng được kích hoạt và các phần mở rộng là trong /usr/lib/php/20160303 thư mục.

Answer 1

Đôi khi sự cố là phần mở rộng php-xml.

Thử:

sudo apt-get install php-xml