我找到了解决方案.如果您看到错误，那么很显然我没有访问权限:

I found the solution. If you see the error then it would be clear that I don't had access to the:

 "/home/username/.composer/cache/files/symfony/security-core/3a27d7b34ee62cb0fdf5ad970e7777912ef4722f.zip".

当我浏览该目录时，我发现它的所有者是'root'或'sudo'.

When I explore this directory, I found that its owner is 'root' or 'sudo'.

所以我删除了'.composer'目录，然后开始在我的laravel项目目录中进行更新，一切都很好.没问题！

So I deleted the '.composer' directory and then started to update in my laravel project directory, every thing was fine and perfect! No problem at all!