Virtualbox cannot be started

After the installation of virtualbox is complete, there is no way to run, and the installation of the extension is also failed, this is the first time encountered, find a solution.

The error message is as follows:

VirtualBox: supR3HardenedVerifyDir: Cannot trust the directory "/opt/VirtualBox": group and/or other writable (st_mode = 040777)

Only the root user has the write and execution permissions, and other users are read-only. (There are so many virtualbox tubes !)

Extension cannot be installed because the opt permission is changed to allow all users to read and write, as long as it is changed to only the root user.

It seems that this problem does not occur if it is installed in the/usr/lib directory, because it is generally owned by root and only can be read and written by root.