$ sudo make modules_install install

SYMLINK /lib/modules/6.7.0-rc6-test/build
  INSTALL /lib/modules/6.7.0-rc6-test/modules.order
  INSTALL /lib/modules/6.7.0-rc6-test/modules.builtin
  INSTALL /lib/modules/6.7.0-rc6-test/modules.builtin.modinfo
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/fs/efivarfs/efivarfs.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/drivers/thermal/intel/x86_pkg_temp_thermal.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/net/netfilter/nf_log_syslog.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/net/netfilter/xt_mark.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/net/netfilter/xt_nat.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/net/netfilter/xt_LOG.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/net/netfilter/xt_MASQUERADE.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/net/netfilter/xt_addrtype.ko
  INSTALL /lib/modules/6.7.0-rc6-test/kernel/net/ipv4/netfilter/iptable_nat.ko
  DEPMOD  /lib/modules/6.7.0-rc6-test
  INSTALL /boot
run-parts: executing /etc/kernel/postinst.d/dkms 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
 * dkms: running auto installation service for kernel 6.7.0-rc6-test
Kernel preparation unnecessary for this kernel. Skipping...

Building module:
cleaning build area...
make -j16 KERNELRELEASE=6.7.0-rc6-test -C /lib/modules/6.7.0-rc6-test/build M=/var/lib/dkms/virtualbox/6.1.38/build...(bad exit status: 2)
ERROR (dkms apport): kernel package linux-headers-6.7.0-rc6-test is not supported
Error! Bad return status for module build on kernel: 6.7.0-rc6-test (x86_64)
Consult /var/lib/dkms/virtualbox/6.1.38/build/make.log for more information.
                                                                                                                                                                                        [ OK ]
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
update-initramfs: Generating /boot/initrd.img-6.7.0-rc6-test
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
run-parts: executing /etc/kernel/postinst.d/update-notifier 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
run-parts: executing /etc/kernel/postinst.d/xx-update-initrd-links 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
I: /boot/initrd.img is now a symlink to initrd.img-6.7.0-rc6-test
run-parts: executing /etc/kernel/postinst.d/zz-runlilo 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
run-parts: executing /etc/kernel/postinst.d/zz-shim 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 6.7.0-rc6-test /boot/vmlinuz-6.7.0-rc6-test
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.7.0-rc6-test
Found initrd image: /boot/initrd.img-6.7.0-rc6-test
Found linux image: /boot/vmlinuz-6.2.0-39-generic
Found initrd image: /boot/initrd.img-6.2.0-39-generic
Memtest86+ needs a 16-bit boot, that is not available on EFI, exiting
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done