I am logging here what I needed to do after I received an Kernel has changed message on my Virtualbox 7.0. After an Ubuntu 22.04 update. The message said I need to run "/sbin/vboxconfig" to rebuild Virtualbox for the new kernel.
On running "/sbin/vboxconfig" I received an error. In the log there was a message "warning: the compiler differs from the one used to build the kernel".
I needed to install gcc-12 after that the "/sbin/vboxconfig" command worked.
sudo -s
apt install gcc-12
/sbin/vboxconfigHope this helps
Reference: https://forums.linuxmint.com/viewtopic.php?t=390626