Can not start virtual machine with error "Failed to open seesion"

[kipade]

I can not start any guest virtual machine on VirtualBox 6.1.2 r139181 with such error message:

Code: Select all

Failed to open a session for the virtual machine Ubuntu-16.04.

The virtual machine 'Ubuntu-16.04' has terminated unexpectedly during startup with exit code 1 (0x1).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: MachineWrap
Interface: IMachine {85632c68-b5bb-4316-a900-5eb28d3413df}

My host is GNU/Slackware 64bits version. How to fix such issue?
Thanks

[scottgus1]

I would recommend a web-search on this:

terminated unexpectedly during startup with exit code 1 (0x1) "NS_ERROR_FAILURE" site:forums.virtualbox.org

This sometimes happens because the version of Virtualbox being run is from the Linxu fork rather than the official Virtualbox download, or that a previous package used by the fork is still loaded and causing trouble. Other causes can be found in the web-search.

If you can't get things going from the web-search, zip and post the Home folder's /.config/VirtualBox/VBoxSVC.log