DRM-NEXT 4.15 не устанавливается, почему?

Поэтому я использую Ubuntu 17.10 и загрузил последнее ядро ​​drm-next отсюда http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-next/2017-12-05/ для amd64

их версия с низкой задержкой (я загрузил 3 ДБ «все», «заголовки с низкой задержкой» и «изображение с низкой задержкой :)»

Когда я sudo dpkg -i *.deb

Я получаю это:

(Reading database ... 345060 files and directories currently installed.)
Preparing to unpack linux-headers-4.15.0-996_4.15.0-996.201712042105_all.deb ...
Unpacking linux-headers-4.15.0-996 (4.15.0-996.201712042105) over (4.15.0-996.201712042105) ...
Preparing to unpack linux-headers-4.15.0-996-lowlatency_4.15.0-996.201712042105_amd64.deb ...
Unpacking linux-headers-4.15.0-996-lowlatency (4.15.0-996.201712042105) over (4.15.0-996.201712042105) ...
Preparing to unpack linux-image-4.15.0-996-lowlatency_4.15.0-996.201712042105_amd64.deb ...
Done.
Unpacking linux-image-4.15.0-996-lowlatency (4.15.0-996.201712042105) over (4.15.0-996.201712042105) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
Setting up linux-headers-4.15.0-996 (4.15.0-996.201712042105) ...
Setting up linux-headers-4.15.0-996-lowlatency (4.15.0-996.201712042105) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
ERROR (dkms apport): kernel package linux-headers-4.15.0-996-lowlatency is not supported
Error! Bad return status for module build on kernel: 4.15.0-996-lowlatency (x86_64)
Consult /var/lib/dkms/virtualbox/5.1.30/build/make.log for more information.
Setting up linux-image-4.15.0-996-lowlatency (4.15.0-996.201712042105) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Not updating initrd symbolic links since we are being updated/reinstalled 
(4.15.0-996.201712042105 was configured last, according to dpkg)
Not updating image symbolic links since we are being updated/reinstalled 
(4.15.0-996.201712042105 was configured last, according to dpkg)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
run-parts: executing /etc/kernel/postinst.d/dkms 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
ERROR (dkms apport): kernel package linux-headers-4.15.0-996-lowlatency is not supported
Error! Bad return status for module build on kernel: 4.15.0-996-lowlatency (x86_64)
Consult /var/lib/dkms/virtualbox/5.1.30/build/make.log for more information.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
update-initramfs: Generating /boot/initrd.img-4.15.0-996-lowlatency
W: Possible missing firmware /lib/firmware/amdgpu/raven_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_me.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_pfp.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_ce.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_vcn.bin for module amdgpu
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.15.0-996-lowlatency /boot/vmlinuz-4.15.0-996-lowlatency
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-041500rc1-lowlatency
Found initrd image: /boot/initrd.img-4.15.0-041500rc1-lowlatency
Found linux image: /boot/vmlinuz-4.15.0-996-lowlatency
Found initrd image: /boot/initrd.img-4.15.0-996-lowlatency
Found linux image: /boot/vmlinuz-4.13.0-18-lowlatency
Found initrd image: /boot/initrd.img-4.13.0-18-lowlatency
Found linux image: /boot/vmlinuz-4.13.0-18-generic
Found initrd image: /boot/initrd.img-4.13.0-18-generic
Found Ubuntu 16.10 (16.10) on /dev/sda2
Adding boot menu entry for EFI firmware configuration
done

, но после перезагрузки и ввода uname -r я все еще получаю как вывод 4.15.0-041500rc1-lowlatency (не смущайтесь, это не то же самое, что мое "старое" ядро, которое происходит чтобы быть немного старше, это не новый, который я пытался установить, DRM-NEXT-l4.15.0-996.201712042105-lowlatency)

Чего мне не хватает?

РЕДАКТИРОВАТЬ: Хорошо, ядро, похоже, присутствует в загрузках grub и ubuntu с новым ядром, но почему оно не стало ядром по умолчанию, как это обычно происходит при обновлении?