Comment 17 for bug 1692127

This worked for me in zesty with apport version 2.20.4-0ubuntu4.4:

DuplicateSignature:
 package:linux-image-4.10.0-22-generic:4.10.0-22.24
 Setting up linux-image-4.10.0-22-generic (4.10.0-22.24) ...
 Running depmod.
 update-initramfs: deferring update (hook will be called later)
 Not updating initrd symbolic links since we are being updated/reinstalled
 (4.10.0-22.24 was configured last, according to dpkg)
 Not updating image symbolic links since we are being updated/reinstalled
 (4.10.0-22.24 was configured last, according to dpkg)
 Examining /etc/kernel/postinst.d.
 run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.10.0-22-generic /boot/vmlinuz-4.10.0-22-generic
 run-parts: executing /etc/kernel/postinst.d/dkms 4.10.0-22-generic /boot/vmlinuz-4.10.0-22-generic
 run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.10.0-22-generic /boot/vmlinuz-4.10.0-22-generic
 update-initramfs: Generating /boot/initrd.img-4.10.0-22-generic
 run-parts: executing /etc/kernel/postinst.d/pm-utils 4.10.0-22-generic /boot/vmlinuz-4.10.0-22-generic
 run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.10.0-22-generic /boot/vmlinuz-4.10.0-22-generic
 run-parts: executing /etc/kernel/postinst.d/update-notifier 4.10.0-22-generic /boot/vmlinuz-4.10.0-22-generic
 run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.10.0-22-generic /boot/vmlinuz-4.10.0-22-generic
 /usr/sbin/grub-mkconfig: 15: /etc/default/grub: Syntax error: Unterminated quoted string
 run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 2
 Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-4.10.0-22-generic.postinst line 1052.
 dpkg: error processing package linux-image-4.10.0-22-generic (--configure):
  subprocess installed post-installation script returned error exit status 2