reg@reg-VirtualBox:~/Downloads$ ls
linux-headers-4.15.0-041500rc9_4.15.0-041500rc9.201801212130_all.deb
linux-headers-4.15.0-041500rc9-generic_4.15.0-041500rc9.201801212130_amd64.deb
linux-image-4.15.0-041500rc9-generic_4.15.0-041500rc9.201801212130_amd64.deb
reg@reg-VirtualBox:~/Downloads$ sudo dpkg -i *
[sudo] password for reg: 
(Reading database ... 262542 files and directories currently installed.)
Preparing to unpack linux-headers-4.15.0-041500rc9_4.15.0-041500rc9.201801212130_all.deb ...
Unpacking linux-headers-4.15.0-041500rc9 (4.15.0-041500rc9.201801212130) over (4.15.0-041500rc9.201801212130) ...
Preparing to unpack linux-headers-4.15.0-041500rc9-generic_4.15.0-041500rc9.201801212130_amd64.deb ...
Unpacking linux-headers-4.15.0-041500rc9-generic (4.15.0-041500rc9.201801212130) over (4.15.0-041500rc9.201801212130) ...
Preparing to unpack linux-image-4.15.0-041500rc9-generic_4.15.0-041500rc9.201801212130_amd64.deb ...
Done.
Unpacking linux-image-4.15.0-041500rc9-generic (4.15.0-041500rc9.201801212130) over (4.15.0-041500rc9.201801212130) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
Setting up linux-headers-4.15.0-041500rc9 (4.15.0-041500rc9.201801212130) ...
Setting up linux-headers-4.15.0-041500rc9-generic (4.15.0-041500rc9.201801212130) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
Setting up linux-image-4.15.0-041500rc9-generic (4.15.0-041500rc9.201801212130) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
initrd.img(/boot/initrd.img-4.15.0-041500rc9-generic
) points to /boot/initrd.img-4.15.0-041500rc9-generic
 (/boot/initrd.img-4.15.0-041500rc9-generic) -- doing nothing at /var/lib/dpkg/info/linux-image-4.15.0-041500rc9-generic.postinst line 491.
vmlinuz(/boot/vmlinuz-4.15.0-041500rc9-generic
) points to /boot/vmlinuz-4.15.0-041500rc9-generic
 (/boot/vmlinuz-4.15.0-041500rc9-generic) -- doing nothing at /var/lib/dpkg/info/linux-image-4.15.0-041500rc9-generic.postinst line 491.
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
run-parts: executing /etc/kernel/postinst.d/dkms 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
update-initramfs: Generating /boot/initrd.img-4.15.0-041500rc9-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
run-parts: executing /etc/kernel/postinst.d/vboxadd 4.15.0-041500rc9-generic /boot/vmlinuz-4.15.0-041500rc9-generic
run-parts: failed to exec /etc/kernel/postinst.d/vboxadd: Exec format error
run-parts: /etc/kernel/postinst.d/vboxadd exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-4.15.0-041500rc9-generic.postinst line 1052.
dpkg: error processing package linux-image-4.15.0-041500rc9-generic (--install):
 installed linux-image-4.15.0-041500rc9-generic package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
 linux-image-4.15.0-041500rc9-generic