1 environment:

Desktop system: Ubuntu 16.04 * x86

VirtualBox version: 5.0.36

Virtual machine installation system: win7 x86

2 phenomenon: unable to start. The following is the detailed information:

Failed to open a session for the virtual machine Windoze 7.

The device helper structure version has changed.

If you have upgraded VirtualBox recently, please make sure you have terminated all VMs and upgraded any extension packs. If this error persists, try re-installing VirtualBox. (VERR_ PDM_ DEVHLPR3_ VERSION_ MISMATCH).

Result Code: NS_ ERROR_ FAILURE (0x80004005) Component: Console

Interface: IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392}

3 solution

① Reference link https://askubuntu.com/questions/386150/virtualbox-fails-to-start-machine-after-installing-extensions

② The command I used was sudo apt get — re install install VirtualBox ext pack, which successfully solved the problem

After entering the command, you will enter the confirmation interface, use the tab key to select the confirmation button, press enter, and then wait for him to finish the prompt

Successfully installed “Oracle VM VirtualBox Extension Pack”