package:nvidia-dkms-390:390.116-0ubuntu1
Setting up nvidia-dkms-390 (390.116-0ubuntu1) ...
update-initramfs: deferring update (trigger activated)
update-initramfs: Generating /boot/initrd.img-4.18.0-20-generic
cp: cannot stat '/initrd.img': No such file or directory
run-parts: /etc/initramfs/post-update.d//zz-update-efistub exited with return code 1
dpkg: error processing package nvidia-dkms-390 (--configure):
 installed nvidia-dkms-390 package post-installation script subprocess returned error exit status 1