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A few days back I tried to install 0ad, a game, through the terminal. I accidentally closed the terminal before it was finished and now I can't install or update any program on my machine. I'm running 13.10.

I have tried searching and found many articles, posts, and discussions around this error but I have yet to find a method that works to fix it.

I have tried running

sudo apt-get clean && sudo apt-get autoremove

which outputs

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following packages will be REMOVED:

  linux-headers-3.11.0-12 linux-headers-3.11.0-12-generic linux-image-3.11.0-12-generic linux-image-extra-3.11.0-12-generic

0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.

7 not fully installed or removed.

After this operation, 210 MB disk space will be freed.

Do you want to continue [Y/n]? Y

(Reading database ... 315931 files and directories currently installed.)

Removing linux-headers-3.11.0-12-generic ...

Removing linux-headers-3.11.0-12 ...

Removing linux-image-extra-3.11.0-12-generic ...

Examining /etc/kernel/postrm.d .

run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

update-initramfs: Deleting /boot/initrd.img-3.11.0-12-generic

run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: Syntax error: EOF in backquote substitution

run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 2

Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-extra-3.11.0-12-generic.postrm line 328.

dpkg: error processing linux-image-extra-3.11.0-12-generic (--remove):

 subprocess installed post-removal script returned error exit status 1

Removing linux-image-3.11.0-12-generic ...

Examining /etc/kernel/prerm.d.

run-parts: executing /etc/kernel/prerm.d/dkms 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

dkms: removing: bbswitch 0.7 (3.11.0-12-generic) (i686)



-------- Uninstall Beginning --------

Module:  bbswitch

Version: 0.7

Kernel:  3.11.0-12-generic (i686)

-------------------------------------



Status: Before uninstall, this module version was ACTIVE on this kernel.



bbswitch.ko:

 - Uninstallation

   - Deleting from: /lib/modules/3.11.0-12-generic/updates/dkms/

 - Original module

   - No original module was found for this module on this kernel.

   - Use the dkms install command to reinstall any previous module version.



depmod.....



DKMS: uninstall completed.

dkms: removing: nvidia-319-updates 319.60 (3.11.0-12-generic) (i686)



-------- Uninstall Beginning --------

Module:  nvidia-319-updates

Version: 319.60

Kernel:  3.11.0-12-generic (i686)

-------------------------------------



Status: Before uninstall, this module version was ACTIVE on this kernel.



nvidia_319_updates.ko:

 - Uninstallation

   - Deleting from: /lib/modules/3.11.0-12-generic/updates/dkms/

 - Original module

   - No original module was found for this module on this kernel.

   - Use the dkms install command to reinstall any previous module version.



depmod....



DKMS: uninstall completed.

Examining /etc/kernel/postrm.d .

run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

update-initramfs: Deleting /boot/initrd.img-3.11.0-12-generic

run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: Syntax error: EOF in backquote substitution

run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 2

Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-3.11.0-12-generic.postrm line 328.

dpkg: error processing linux-image-3.11.0-12-generic (--remove):

 subprocess installed post-removal script returned error exit status 1

Errors were encountered while processing:

 linux-image-extra-3.11.0-12-generic

 linux-image-3.11.0-12-generic

E: Sub-process /usr/bin/dpkg returned an error code (1)

Then I also tried running

sudo dpkg --configure -a

which outputs

dpkg: dependency problems prevent configuration of linux-image-extra-3.11.0-15-generic:

 linux-image-extra-3.11.0-15-generic depends on linux-image-3.11.0-15-generic; however:

  Package linux-image-3.11.0-15-generic is not configured yet.



dpkg: error processing linux-image-extra-3.11.0-15-generic (--configure):

 dependency problems - leaving unconfigured

Setting up linux-image-3.11.0-17-generic (3.11.0-17.31) ...

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 3.11.0-17-generic /boot/vmlinuz-3.11.0-17-generic

run-parts: executing /etc/kernel/postinst.d/dkms 3.11.0-17-generic /boot/vmlinuz-3.11.0-17-generic

run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.11.0-17-generic /boot/vmlinuz-3.11.0-17-generic

update-initramfs: Generating /boot/initrd.img-3.11.0-17-generic

run-parts: executing /etc/kernel/postinst.d/pm-utils 3.11.0-17-generic /boot/vmlinuz-3.11.0-17-generic

run-parts: executing /etc/kernel/postinst.d/update-notifier 3.11.0-17-generic /boot/vmlinuz-3.11.0-17-generic

run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.11.0-17-generic /boot/vmlinuz-3.11.0-17-generic

/usr/sbin/grub-mkconfig: 35: /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-3.11.0-17-generic.postinst line 1010.

dpkg: error processing linux-image-3.11.0-17-generic (--configure):

 subprocess installed post-installation script returned error exit status 2

dpkg: dependency problems prevent configuration of linux-image-extra-3.11.0-17-generic:

 linux-image-extra-3.11.0-17-generic depends on linux-image-3.11.0-17-generic; however:

  Package linux-image-3.11.0-17-generic is not configured yet.



dpkg: error processing linux-image-extra-3.11.0-17-generic (--configure):

 dependency problems - leaving unconfigured

dpkg: dependency problems prevent configuration of linux-image-generic:

 linux-image-generic depends on linux-image-3.11.0-17-generic; however:

  Package linux-image-3.11.0-17-generic is not configured yet.

 linux-image-generic depends on linux-image-extra-3.11.0-17-generic; however:

  Package linux-image-extra-3.11.0-17-generic is not configured yet.



dpkg: error processing linux-image-generic (--configure):

 dependency problems - leaving unconfigured

dpkg: dependency problems prevent configuration of linux-generic:

 linux-generic depends on linux-image-generic (= 3.11.0.17.18); however:

  Package linux-image-generic is not configured yet.



dpkg: error processing linux-generic (--configure):

 dependency problems - leaving unconfigured

dpkg: dependency problems prevent configuration of linux-generic-pae:

 linux-generic-pae depends on linux-generic (= 3.11.0.17.18); however:

  Package linux-generic is not configured yet.



dpkg: error processing linux-generic-pae (--configure):

 dependency problems - leaving unconfigured

Errors were encountered while processing:

 linux-image-extra-3.11.0-15-generic

 linux-image-3.11.0-17-generic

 linux-image-extra-3.11.0-17-generic

 linux-image-generic

 linux-generic

 linux-generic-pae

I'm at a loss and do not know where to go from here.

Any help you could provide will be greatly appreciated.

The output of

uname -r

is

3.11.0-15-generic

EDIT

I ran

sudo dpkg -P linux-image-3.11.0-12-generic

and got output

(Reading database ... 286111 files and directories currently installed.)

Removing linux-image-3.11.0-12-generic ...

Examining /etc/kernel/postrm.d .

run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

update-initramfs: Deleting /boot/initrd.img-3.11.0-12-generic

run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: Syntax error: EOF in backquote substitution

run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 2

Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-3.11.0-12-generic.postrm line 328.

dpkg: error processing linux-image-3.11.0-12-generic (--purge):

 subprocess installed post-removal script returned error exit status 1

Errors were encountered while processing:

 linux-image-3.11.0-12-generic

I then ran

sudo apt-get install -f

and got output

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following packages will be REMOVED:

  linux-image-3.11.0-12-generic linux-image-extra-3.11.0-12-generic

0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.

9 not fully installed or removed.

After this operation, 136 MB disk space will be freed.

Do you want to continue [Y/n]? Y

(Reading database ... 286111 files and directories currently installed.)

Removing linux-image-extra-3.11.0-12-generic ...

Examining /etc/kernel/postrm.d .

run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

update-initramfs: Deleting /boot/initrd.img-3.11.0-12-generic

run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: Syntax error: EOF in backquote substitution

run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 2

Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-extra-3.11.0-12-generic.postrm line 328.

dpkg: error processing linux-image-extra-3.11.0-12-generic (--remove):

 subprocess installed post-removal script returned error exit status 1

Removing linux-image-3.11.0-12-generic ...

Examining /etc/kernel/postrm.d .

run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

update-initramfs: Deleting /boot/initrd.img-3.11.0-12-generic

run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.11.0-12-generic /boot/vmlinuz-3.11.0-12-generic

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: Syntax error: EOF in backquote substitution

run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 2

Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-3.11.0-12-generic.postrm line 328.

dpkg: error processing linux-image-3.11.0-12-generic (--remove):

 subprocess installed post-removal script returned error exit status 1

Errors were encountered while processing:

 linux-image-extra-3.11.0-12-generic

 linux-image-3.11.0-12-generic

E: Sub-process /usr/bin/dpkg returned an error code (1)

Your problem may be related to debconf database corruption.

Run the following:

sudo /usr/share/debconf/fix_db.pl

You might have fixed the problem right there.

Check to see if any of these templates were effected by running the following bash commands:

diff -u /var/cache/debconf/config.dat{-old,}    | grep ^[+-]Name

diff -u /var/cache/debconf/templates.dat{-old,} | grep ^[+-]Name

You may sill want to run the following command on the package that was causing trouble:

 dpkg-reconfigure <your package>  

The error message is pretty self-explanatory:

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: Syntax error: EOF in backquote substitution

You have an error in your /etc/default/grub.