Preparing to replace ubuntu-minimal 1.304 (using .../ubuntu-minimal_1.305_amd64.deb) ...
Unpacking replacement ubuntu-minimal ...
Preparing to replace ubuntu-standard 1.304 (using .../ubuntu-standard_1.305_amd64.deb) ...
Unpacking replacement ubuntu-standard ...
Preparing to replace signon-ui 0.15+13.10.20131003.1-0ubuntu1 (using .../signon-ui_0.15+13.10.20131011-0ubuntu1_amd64.deb) ...
Unpacking replacement signon-ui ...
Preparing to replace ubuntu-desktop 1.304 (using .../ubuntu-desktop_1.305_amd64.deb) ...
Unpacking replacement ubuntu-desktop ...
Processing triggers for desktop-file-utils ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for gnome-menus ...
Processing triggers for mime-support ...
Setting up linux-image-3.11.0-12-generic (3.11.0-12.19) ...
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 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic
run-parts: executing /etc/kernel/postinst.d/dkms 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic
update-initramfs: Generating /boot/initrd.img-3.11.0-12-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic
/usr/sbin/grub-mkconfig: 34: /etc/default/grub: Syntax error: EOF in backquote substitution
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-3.11.0-12-generic.postinst line 1010.
dpkg: error processing linux-image-3.11.0-12-generic (--configure):
 subprocess installed post-installation script returned error exit status 2
Setting up grub-efi-amd64 (2.00-19ubuntu2) ...
/var/lib/dpkg/info/grub-efi-amd64.config: 34: /etc/default/grub: Syntax error: EOF in backquote substitution
dpkg: error processing grub-efi-amd64 (--configure):
 subprocess installed post-installation script returned error exit status 2