Php Can'；t运行编写器更新缺少mbstring

已解决： 我最终使用了php7.2而不是php7.4，我删除了7.4并安装了7.2

因此，我试图将Linux Ubuntu 20.04服务器配置为运行laravel，我安装了nginx、mysql php7.4-fpm，我从gitlab克隆了我的项目，现在我想运行composer update，但它总是给我以下错误：

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

  Problem 1
    - laravel/framework v7.9.2 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.9.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.9.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.8.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.8.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.7.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.7.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.6.2 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.6.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.6.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.5.2 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.5.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.5.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.4.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.3.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.2.2 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.2.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.2.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.19.1 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.19.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.18.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.17.2 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.17.1 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.17.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.16.1 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.16.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.15.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.14.1 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.14.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.13.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.12.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.11.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.10.3 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.10.2 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.10.1 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.10.0 requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - laravel/framework v7.1.3 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.1.2 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.1.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.1.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.8 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.7 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.6 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.5 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.4 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.3 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.2 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.1 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework v7.0.0 requires ext-mbstring * -> the requested PHP exte                                        nsion mbstring is missing from your system.
    - laravel/framework 7.x-dev requires ext-mbstring * -> the requested PHP ext                                        ension mbstring is missing from your system.
    - Installation request for laravel/framework ^7.0 -> satisfiable by laravel/                                        framework[7.x-dev, v7.0.0, v7.0.1, v7.0.2, v7.0.3, v7.0.4, v7.0.5, v7.0.6, v7.0.                                        7, v7.0.8, v7.1.0, v7.1.1, v7.1.2, v7.1.3, v7.10.0, v7.10.1, v7.10.2, v7.10.3, v                                        7.11.0, v7.12.0, v7.13.0, v7.14.0, v7.14.1, v7.15.0, v7.16.0, v7.16.1, v7.17.0,                                         v7.17.1, v7.17.2, v7.18.0, v7.19.0, v7.19.1, v7.2.0, v7.2.1, v7.2.2, v7.3.0, v7.                                        4.0, v7.5.0, v7.5.1, v7.5.2, v7.6.0, v7.6.1, v7.6.2, v7.7.0, v7.7.1, v7.8.0, v7.                                        8.1, v7.9.0, v7.9.1, v7.9.2].

  To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php/7.4/cli/php.ini
    - /etc/php/7.4/cli/conf.d/10-mysqlnd.ini
    - /etc/php/7.4/cli/conf.d/10-opcache.ini
    - /etc/php/7.4/cli/conf.d/10-pdo.ini
    - /etc/php/7.4/cli/conf.d/20-calendar.ini
    - /etc/php/7.4/cli/conf.d/20-ctype.ini
    - /etc/php/7.4/cli/conf.d/20-exif.ini
    - /etc/php/7.4/cli/conf.d/20-ffi.ini
    - /etc/php/7.4/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.4/cli/conf.d/20-ftp.ini
    - /etc/php/7.4/cli/conf.d/20-gettext.ini
    - /etc/php/7.4/cli/conf.d/20-iconv.ini
    - /etc/php/7.4/cli/conf.d/20-json.ini
    - /etc/php/7.4/cli/conf.d/20-mysqli.ini
    - /etc/php/7.4/cli/conf.d/20-pdo_mysql.ini
    - /etc/php/7.4/cli/conf.d/20-phar.ini
    - /etc/php/7.4/cli/conf.d/20-posix.ini
    - /etc/php/7.4/cli/conf.d/20-readline.ini
    - /etc/php/7.4/cli/conf.d/20-shmop.ini
    - /etc/php/7.4/cli/conf.d/20-sockets.ini
    - /etc/php/7.4/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.4/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.4/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.4/cli/conf.d/20-tokenizer.ini
  You can also run `php --ini` inside terminal to see which files are used by PH                                        P in CLI mode.

当我运行php--ini时，这是输出

administrator@orion:/var/www/truckstock$ php --ini
Configuration File (php.ini) Path: /etc/php/7.4/cli
Loaded Configuration File:         /etc/php/7.4/cli/php.ini
Scan for additional .ini files in: /etc/php/7.4/cli/conf.d
Additional .ini files parsed:      /etc/php/7.4/cli/conf.d/10-mysqlnd.ini,
/etc/php/7.4/cli/conf.d/10-opcache.ini,
/etc/php/7.4/cli/conf.d/10-pdo.ini,
/etc/php/7.4/cli/conf.d/20-calendar.ini,
/etc/php/7.4/cli/conf.d/20-ctype.ini,
/etc/php/7.4/cli/conf.d/20-exif.ini,
/etc/php/7.4/cli/conf.d/20-ffi.ini,
/etc/php/7.4/cli/conf.d/20-fileinfo.ini,
/etc/php/7.4/cli/conf.d/20-ftp.ini,
/etc/php/7.4/cli/conf.d/20-gettext.ini,
/etc/php/7.4/cli/conf.d/20-iconv.ini,
/etc/php/7.4/cli/conf.d/20-json.ini,
/etc/php/7.4/cli/conf.d/20-mysqli.ini,
/etc/php/7.4/cli/conf.d/20-pdo_mysql.ini,
/etc/php/7.4/cli/conf.d/20-phar.ini,
/etc/php/7.4/cli/conf.d/20-posix.ini,
/etc/php/7.4/cli/conf.d/20-readline.ini,
/etc/php/7.4/cli/conf.d/20-shmop.ini,
/etc/php/7.4/cli/conf.d/20-sockets.ini,
/etc/php/7.4/cli/conf.d/20-sysvmsg.ini,
/etc/php/7.4/cli/conf.d/20-sysvsem.ini,
/etc/php/7.4/cli/conf.d/20-sysvshm.ini,
/etc/php/7.4/cli/conf.d/20-tokenizer.ini

为了解决这个问题，我尝试使用命令sudo apt install php7.4-mbstring安装php mbstring，这就是我遇到的错误

administrator@orion:/etc/php/7.4/mods-available$ sudo apt install php7.4-mbstring
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 php7.4-mbstring : Depends: libonig5 (>= 6.8.1) but it is not installable
E: Unable to correct problems, you have held broken packages.
administrator@orion:/etc/php/7.4/mods-available$

---

有人知道如何解决此问题吗？

以下是您需要在服务器上执行的命令

sudo apt update
sudo apt install php-mbstring

---

因此，当我运行时，我安装了php mbstring，但对于php7.2

root@orion：~#apt安装php mbstring读取包列表。。。已完成构建依赖关系树以读取状态信息。。。Done php mbstring已经是最新版本（1:7.2+60ubuntu1）。0已升级，0已新安装，0已删除，91未升级。root@orion：~#

对于7.2，您必须键入

sudo apt install php7.2-mbstring

我需要它来为php7.4 adn安装它，当我尝试它时，它会说`php7.4-mbstring:dependens:libonig5（>=6.8.1）但它是不可安装的`请添加php版本和composer版本。是什么阻止您安装缺少的依赖项？php是7.4，它不会安装php7.4-mbstring我收到此错误

php7.4-mbstring:dependens:libonig5（>=6.8.1），但它不可安装

请分享更多详细信息*为什么该软件包不能安装？应该是这样的，因为它没有太多的依赖项，而且它在Ubuntu 20.04中以v6.9.2的形式提供。“你拿着坏包裹”听起来像是一个更大的问题