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

Hope this helps

Reference: https://forums.linuxmint.com/viewtopic.php?t=390626

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