multiple errors in the file ~/.xsession-errors.
That error is only brought by the new "mantic minotaur" iso image
the errors are related to caja file browser
2 virtualbox installed from synaptic along with its dependencies; virtualbox-dkms virtualbox-guest-addition-iso
It does not play sound, possibly incompatibility with the kernel update (apt upgrade).
Is there a way to reload the virtualbox modules to the kernel.