Всякий раз, когда я пытаюсь что-то установить, возникает эта ошибка. Что мне делать?

afaan@afaan-VivoBook-ASUS-Laptop-X505ZA-X505ZA:~$ sudo apt purge libplymouth2
[sudo] password for afaan: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  libplymouth2* linux-image-3.13.0-32-generic
  linux-image-extra-3.13.0-32-generic
0 upgraded, 0 newly installed, 3 to remove and 1672 not upgraded.
9 not fully installed or removed.
After this operation, 194 MB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 221803 files and directories currently installed.)
Removing linux-image-extra-3.13.0-32-generic (3.13.0-32.57) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.13.0-32-generic /boot/vmlinuz-3.13.0-32-generic
update-initramfs: Deleting /boot/initrd.img-3.13.0-32-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.13.0-32-generic /boot/vmlinuz-3.13.0-32-generic
/usr/sbin/grub-mkconfig: 1: /etc/default/grub: a#: not found
run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 127
Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-extra-3.13.0-32-generic.postrm line 328.
dpkg: error processing package linux-image-extra-3.13.0-32-generic (--remove):
 subprocess installed post-removal script returned error exit status 1
Removing linux-image-3.13.0-32-generic (3.13.0-32.57) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.13.0-32-generic /boot/vmlinuz-3.13.0-32-generic
update-initramfs: Deleting /boot/initrd.img-3.13.0-32-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.13.0-32-generic /boot/vmlinuz-3.13.0-32-generic
/usr/sbin/grub-mkconfig: 1: /etc/default/grub: a#: not found
run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 127
Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-3.13.0-32-generic.postrm line 328.
dpkg: error processing package linux-image-3.13.0-32-generic (--remove):
 subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
 linux-image-extra-3.13.0-32-generic
 linux-image-3.13.0-32-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)