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我正在尝试解决此错误，并到处寻找答案。我检查了它们都在ini文件中启用，它给了我错误。

使用包信息加载作曲家存储库 从锁定文件安装依赖项 您的需求无法解析为可安装的包集。

问题 1 - sabre/xml dev-master 的安装请求 -> sabre/xml [dev-master] 可满足。- sabre/xml dev-master 需要 ext-dom * -> 您的系统中缺少请求的 PHP 扩展 dom。

To enable extensions, verify that they are enabled in those .ini files:
    - /etc/php/7.0/cli/php.ini
    - /etc/php/7.0/cli/conf.d/10-mysqlnd.ini
    - /etc/php/7.0/cli/conf.d/10-opcache.ini
    - /etc/php/7.0/cli/conf.d/10-pdo.ini
    - /etc/php/7.0/cli/conf.d/20-calendar.ini
    - /etc/php/7.0/cli/conf.d/20-ctype.ini
    - /etc/php/7.0/cli/conf.d/20-curl.ini
    - /etc/php/7.0/cli/conf.d/20-exif.ini
    - /etc/php/7.0/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.0/cli/conf.d/20-ftp.ini
    - /etc/php/7.0/cli/conf.d/20-gd.ini
    - /etc/php/7.0/cli/conf.d/20-gettext.ini
    - /etc/php/7.0/cli/conf.d/20-iconv.ini
    - /etc/php/7.0/cli/conf.d/20-igbinary.ini
    - /etc/php/7.0/cli/conf.d/20-imap.ini
    - /etc/php/7.0/cli/conf.d/20-json.ini
    - /etc/php/7.0/cli/conf.d/20-mbstring.ini
    - /etc/php/7.0/cli/conf.d/20-mcrypt.ini
    - /etc/php/7.0/cli/conf.d/20-mysqli.ini
    - /etc/php/7.0/cli/conf.d/20-pdo_mysql.ini
    - /etc/php/7.0/cli/conf.d/20-pdo_pgsql.ini
    - /etc/php/7.0/cli/conf.d/20-pdo_sqlite.ini
    - /etc/php/7.0/cli/conf.d/20-pgsql.ini
    - /etc/php/7.0/cli/conf.d/20-phar.ini
    - /etc/php/7.0/cli/conf.d/20-posix.ini
    - /etc/php/7.0/cli/conf.d/20-readline.ini
    - /etc/php/7.0/cli/conf.d/20-shmop.ini
    - /etc/php/7.0/cli/conf.d/20-sockets.ini
    - /etc/php/7.0/cli/conf.d/20-sqlite3.ini
    - /etc/php/7.0/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.0/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.0/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.0/cli/conf.d/20-tokenizer.ini
    - /etc/php/7.0/cli/conf.d/20-zlib.ini
    - /etc/php/7.0/cli/conf.d/25-memcached.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
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1 回答 1

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升级到 ubuntu 16.04 后，我遇到了同样的问题，默认情况下，php7 附带。我能够通过运行以下命令来解决它运行更新命令：

      sudo apt-get update

他们的 mycript 丢失了，需要安装：

      sudo apt-get install mcrypt php7.0-mcrypt

运行升级命令：

      sudo apt-get upgrade

安装同样缺失的 php-mbstring：

     sudo apt-get install php-mbstring

安装同样缺失的 phpunit：

     sudo apt-get install phpunit

它奏效了。

于 2016-05-30T08:50:26.690 回答