# Fix Laravel Composer Requirements Could Not Be Resolved

> Resolve the Laravel Composer error about uninstallable packages by installing missing PHP extensions like php-xml and php-curl with apt-get

**URL:** https://sentry.io/answers/laravel-requirements-could-not-be-resolved/

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## The Problem

When creating a Laravel project on Linux, you may get the error `Your requirements could not be resolved to an installable set of packages`.

This error could be caused by any number of missing dependencies, for example, you can get an error such as:

```
  - Root composer.json requires laravel/pint ^1.0 -> satisfiable by laravel/pint[v1.0.0, v1.1.0, v1.1.1].
  - laravel/pint[v1.0.0, ..., v1.1.1] require ext-xml * -> it is missing from your system. Install or enable PHP's xml extension.
```

The important message here is the second line — that `ext-xml` is missing from your system. This is a system-level omission, not a PHP error.

## The Solution

This error has a simple solution. On Debian-based systems, install the missing dependency with `apt-get`. (On RedHat-based systems use `yum`.)

For example:

```sh
apt-get update
apt-get install php-xml
apt-get install php-curl
```

If you don't have root privileges, prefix the commands with `sudo`.

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*Source: [sentry.io/answers/laravel-requirements-could-not-be-resolved/](https://sentry.io/answers/laravel-requirements-could-not-be-resolved/)*