This crash appears here at kernel upgrade today:
Upgrade log:

(Reading database ... 252421 files and directories currently installed.)
Removing linux-signed-generic (4.14.0.13.14) ...
Selecting previously unchecked package linux-image-4.14.0-14-generic.
(Reading database ... 252419 files and directories currently installed.)
Preparing to Unpack ... / 0-linux-image-4.14.0-14-generic_4.14.0-14.17_amd64.deb ...
Examining /etc/kernel/preinst.d/
run-parts: executing /etc/kernel/preinst.d/intel-microcode 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
Done.
Unpacking linux-image-4.14.0-14-generic (4.14.0-14.17) ...
To select previously unchecked package linux-image-extra-4.14.0-14-generic.
Preparing to Unpack ... / 1-linux-image-extra-4.14.0-14-generic_4.14.0-14.17_amd64.deb ...
Unpacking linux-image-extra-4.14.0-14-generic (4.14.0-14.17) ...
Preparing to Unpack ... / 2-linux-generic_4.14.0.14.15_amd64.deb ...
Unpacking linux-generic (4.14.0.14.15) about (4.14.0.13.14) ...
Preparing to Unpack ... / 3-linux-image-generic_4.14.0.14.15_amd64.deb ...
Unpacking linux-image-generic (4.14.0.14.15) about (4.14.0.13.14) ...
To select previously unchecked package linux-headers-4.14.0-14.
Preparing to Unpack ... / 4-linux-headers-4.14.0-14_4.14.0-14.17_all.deb ...
Unpacking linux-headers-4.14.0-14 (4.14.0-14.17) ...
To select previously unchecked package linux-headers-4.14.0-14-generic.
Preparing to Unpack ... / 5-linux-headers-4.14.0-14-generic_4.14.0-14.17_amd64.deb ...
Unpacking linux-headers-4.14.0-14-generic (4.14.0-14.17) ...
Preparing to Unpack ... / 6-linux-headers-generic_4.14.0.14.15_amd64.deb ...
Unzipping linux-headers-generic (4.14.0.14.15) about (4.14.0.13.14) ...
Preparing to Unpack ... / 7-linux-libc-dev_4.14.0-14.17_amd64.deb ...
Unpacking linux-libc-dev: amd64 (4.14.0-14.17) about (4.14.0-13.15) ...
Configuring linux-libc-dev: amd64 (4.14.0-14.17) ...
Configuring linux-headers-4.14.0-14 (4.14.0-14.17) ...
Configuring linux-headers-4.14.0-14-generic (4.14.0-14.17) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
Error! Bad return status for module build on kernel: 4.14.0-14-generic (x86_64)
Consult /var/lib/dkms/nvidia-384/384.90/build/make.log for more information.
Configuring linux-headers-generic (4.14.0.14.15) ...
Configuring linux-image-4.14.0-14-generic (4.14.0-14.17) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/dkms 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
ERROR: Can not create report: [Errno 17] File exists: '/var/crash/nvidia-384.0.crash'
Error! Bad return status for module build on kernel: 4.14.0-14-generic (x86_64)
Consult /var/lib/dkms/nvidia-384/384.90/build/make.log for more information.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
update-initramfs: Generating /boot/initrd.img-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Linux image found: /boot/vmlinuz-4.14.0-14-generic
Initrd image found: /boot/initrd.img-4.14.0-14-generic
Linux image found: /boot/vmlinuz-4.14.0-13-generic
Initrd image found: /boot/initrd.img-4.14.0-13-generic
Linux image found: /boot/vmlinuz-4.13.0-17-generic
Initrd image found: /boot/initrd.img-4.13.0-17-generic
Adding boot menu entry for EFI firmware configuration
completed
Configuring linux-image-extra-4.14.0-14-generic (4.14.0-14.17) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/dkms 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
ERROR: Can not create report: [Errno 17] File exists: '/var/crash/nvidia-384.0.crash'
Error! Bad return status for module build on kernel: 4.14.0-14-generic (x86_64)
Consult /var/lib/dkms/nvidia-384/384.90/build/make.log for more information.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
update-initramfs: Generating /boot/initrd.img-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.14.0-14-generic /boot/vmlinuz-4.14.0-14-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Linux image found: /boot/vmlinuz-4.14.0-14-generic
Initrd image found: /boot/initrd.img-4.14.0-14-generic
Linux image found: /boot/vmlinuz-4.14.0-13-generic
Initrd image found: /boot/initrd.img-4.14.0-13-generic
Linux image found: /boot/vmlinuz-4.13.0-17-generic
Initrd image found: /boot/initrd.img-4.13.0-17-generic
Adding boot menu entry for EFI firmware configuration
completed
Configuring linux-image-generic (4.14.0.14.15) ...
Configuring linux-generic (4.14.0.14.15) ...