Comment 2 for bug 1780020

Processing triggers for initramfs-tools (0.130ubuntu3.1) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-23-generic
Processing triggers for linux-image-4.15.0-24-generic (4.15.0-24.26) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-24-generic
/usr/share/initramfs-tools/hooks/framebuffer: 141: /usr/share/initramfs-tools/hooks/framebuffer: Cannot fork
/usr/share/initramfs-tools/hooks/framebuffer: 65: /usr/share/initramfs-tools/hooks/framebuffer: Cannot fork
E: /usr/share/initramfs-tools/hooks/framebuffer failed with return 2.
/usr/sbin/mkinitramfs: 181: /usr/sbin/mkinitramfs: Cannot fork
/usr/sbin/update-initramfs: 165: /usr/sbin/update-initramfs: Cannot fork
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2
dpkg: error processing package linux-image-4.15.0-24-generic (--configure):
 installed linux-image-4.15.0-24-generic package post-installation script subprocess returned error exit status 1