create-project 报错:[Symfony\...\ProcessTimeOutException]?

composer create-project过程中出现的异常:

1. Installing symfony/http-foundation (v3.4.12): Downloading(failed)
   2.Installing laravel/framework (v5.5.40): Downloading(20%)
   Failed to download laravel/framework from dist: Content-Length mismatch,received 107423 bytes out of the expected 971624.
   3.[Symfony\Component\Process\Exception\ ProcessTimeOutException]
   The process
   "
   git clone --no-checkout 'https://github.com/laravel/**frameworks**....'
   '/home.vagrant/Code/larabbs/vendor/laravel/framework' &&
   cd '/home/vagrant/Code/larabbs/vendor/laravel/framework' &&
   git remote add composer 'https://github.com/laravel/**framework**.g...' &&
   git fetch composer
   "
   exceeded the timeout of 300 seconds.