I recently upgraded Ubuntu 18.04lts to 20.04lts. Now I receive the same error if I am trying to remove, purge, install anything in the terminal. I am at a loss on this, anything I have tried to find online requires some sort of action in the terminal which still gives me the same output.

dpkg: error processing package linux-image-4.15.0-88-generic (--remove):

 installed linux-image-4.15.0-88-generic package post-removal script subprocess returned error exit status 1

dpkg: too many errors, stopping



Errors were encountered while processing:

 linux-image-4.15.0-88-generic

Processing was halted because there were too many errors.

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

output for sudo apt update:

Get:1 http://us.archive.ubuntu.com/ubuntu focal InRelease [265 kB]

Hit:2 http://security.ubuntu.com/ubuntu focal-security InRelease               

Hit:3 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu focal InRelease     

Hit:4 http://download.opensuse.org/repositories/home:/strycore/Debian_10 ./ InRelease

Hit:5 http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal InRelease       

Get:6 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [89.1 kB]

Hit:7 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease

Get:8 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [2,004 B]

Get:9 http://us.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [648 B]

Fetched 357 kB in 2s (224 kB/s)   

Reading package lists... Done

Building dependency tree       

Reading state information... Done

1 package can be upgraded. Run 'apt list --upgradable' to see it.

sudo apt autoremove:

sudo apt autoremove

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following packages will be REMOVED:

  linux-image-4.15.0-88-generic

0 upgraded, 0 newly installed, 1 to remove and 1 not upgraded.

1 not fully installed or removed.

After this operation, 8,402 kB disk space will be freed.

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

(Reading database ... 211935 files and directories currently installed.)

Removing linux-image-4.15.0-88-generic (4.15.0-88.88) ...

/etc/kernel/postrm.d/initramfs-tools:

update-initramfs: Deleting /boot/initrd.img-4.15.0-88-generic

/etc/kernel/postrm.d/zz-update-grub:

Sourcing file `/etc/default/grub'

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: ^x: not found

run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 127

dpkg: error processing package linux-image-4.15.0-88-generic (--remove):

 installed linux-image-4.15.0-88-generic package post-removal script subprocess 

returned error exit status 1

dpkg: too many errors, stopping

Errors were encountered while processing:

 linux-image-4.15.0-88-generic

Processing was halted because there were too many errors.

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

I think I am at the point where I have to format my harddrive and just install a fresh OS. It seems every thread I go to requires some form of work around in the terminal. Nothing I do works in terminal. Unless someone knows a gui rout to fix it.

 cat /etc/default/grub

# If you change this file, run 'update-grub' afterwards to update

# /boot/grub/grub.cfg.

# For full documentation of the options in this file, see:

#   info -f grub -n 'Simple configuration'



GRUB_DEFAULT=0

GRUB_TIMEOUT_STYLE=hidden

GRUB_TIMEOUT=10

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

GRUB_CMDLINE_LINUX=""



# Uncomment to enable BadRAM filtering, modify to suit your needs

# This works with Linux (no patch required) and with any kernel that obtains

# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"



# Uncomment to disable graphical terminal (grub-pc only)

#GRUB_TERMINAL=console



# The resolution used on graphical terminal

# note that you can use only modes which your graphic card supports via VBE

# you can see them in real GRUB with the command `vbeinfo'

#GRUB_GFXMODE=640x480



# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

#GRUB_DISABLE_LINUX_UUID=true



# Uncomment to disable generation of recovery mode menu entries

#GRUB_DISABLE_RECOVERY="true"



# Uncomment to get a beep at grub start

#GRUB_INIT_TUNE="480 440 1"



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