Ошибка symbol grub file filters not found

I too encountered the exact same problem after updating to Ubuntu 19.10. Here is how I (just now) resolved it:

First, you have two problems, not one. Both your installation is screwed up and the Grub Bootloader is messed up. And running only one fix won’t fix everything. You need both the «boot-repair-disk» and the latest version of Ubuntu (both on USB boot drives. Don’t use a DVD.)

If you try to do (only) a «Repair Install» from the Ubuntu Live disk first, you’ll still be greeted by the «grub rescue>» prompt when done. 🙁 So, first you must use the «boot-repair-disk». Tell it to repair your broken boot partition with Ubuntu on it. If you aren’t sure of the partition ID, launch «GParted» from the «Start» menu (bottom left.)

Repair that boot partition. This should at least bring Grub back. Try to launch Ubuntu. If it works, you’re done. If not, boot the Live «CD» from USB.

Double-click the «Install Ubuntu 19.10» icon on the desktop (don’t worry, there will be an option to repair w/o losing your old programs/files.)

I recommend checking the boxes to download all updates during install, including 3rd party.

The Installer should detect your broken partition and give you the option to repair it (the first option.) It may need to disable some 3rd party repositories. Not a big deal, they’re easy enough to get back later.

(Note: If you had to login with a password before, don’t try to select «login w/o password» now. It won’t let you in when you’re done.)

Once done, you should have Ubuntu 19.10 installed with all/most of your existing apps still installed (though the toolbar shortcuts will be reset.) I had to reinstall a few 3rd party apps, but their configurations were still there afterwards, so nothing was lost.

After apt-get update; apt-get upgrade successfully on my Kali Linux VM, restarted to finish some installations and was taken to grub rescue mode.

On grub rescue >

ls, returns:

(hd0) (hd0,msdos1) (hd0,msdos5)

set, returns:

cmdpath=(hd0)
prefix=(hd0,msdos1)/boot/grub
root=hd0,msdos1

I ran ls on (hd0)/boot, (hd0,msdos1)/boot, (hd0,msdos5)/boot, and confirmed results of bootable images only on (hd0,msdos1)

insmod linux, returns following grub error:

symbol 'grub_file_filters' not found 

Wanted to see where grub is looking so tried insmod kali which returned:

/boot/grub/i386-pc/kali.mod not found

Hence it seems that the linux module is found before I get the error.

From research, found that this error is filesystem/USB device related but since this is a Virtual image (and I’m on VirtualBox) I am unsure of how to fix it.

No problem in installing again from scratch but curious about this error and what it is referring to / how it can be resolved.

Thanks for any insights

Additional Note:
This is the output on my screen from the moment I boot the VM and after I execute some of the ls commands mentioned above

error: symbol ‘grub_file_filters’ not found. 
Entering rescue mode... 
grub rescue> ls 
(hd0) (hd0,msdos5) (hd0,msdos1) 
grub rescue> ls (hd0) 
(hd0): Filesystem is unknown. 
grub rescue> ls (hd0,msdos5) 
(hd0,msdos5): Filesystem is unknown. 
grub rescue> ls (hd0,msdos1) 
(hd0,msdos1): Filesystem is ext2. 
grub rescue> ls (hd0)/boot
error: unknown filesystem
grub rescue> ls (hd0,msdos5)/boot
error: unknown filesystem
grub rescue> ls (hd0,msdos1)/boot
./ . ./ System.map-4.18.0-kali2-amd64 config-4.18.0-kali2-amd64 
initrd.img—4.18.0-kali2-amd64 vmlinuz-4.18.0-kali2-amd64 
grub/ config-4.19.0-kali5-amd64 vmlinuz-4.19.0-kali5-amd64 
System.map-4.19.0-kali5-amd64 initrd.img-4.19.0-kali5-amd64
grub rescue> 

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1  45b1a8e3-5fb4-48d8-89f0-532c516a8262
else
  search --no-floppy --fs-uuid --set=root 45b1a8e3-5fb4-48d8-89f0-532c516a8262
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_input console
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-45b1a8e3-5fb4-48d8-89f0-532c516a8262' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='hd1,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1  45b1a8e3-5fb4-48d8-89f0-532c516a8262
	else
	  search --no-floppy --fs-uuid --set=root 45b1a8e3-5fb4-48d8-89f0-532c516a8262
	fi
	echo	'Loading Linux linux-lts ...'
	linux	/boot/vmlinuz-linux-lts root=UUID=45b1a8e3-5fb4-48d8-89f0-532c516a8262 rw  loglevel=3 quiet
	echo	'Loading initial ramdisk ...'
	initrd	/boot/intel-ucode.img /boot/initramfs-linux-lts.img
}
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-45b1a8e3-5fb4-48d8-89f0-532c516a8262' {
	menuentry 'Arch Linux, with Linux linux-lts' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-lts-advanced-45b1a8e3-5fb4-48d8-89f0-532c516a8262' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod ext2
		set root='hd1,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1  45b1a8e3-5fb4-48d8-89f0-532c516a8262
		else
		  search --no-floppy --fs-uuid --set=root 45b1a8e3-5fb4-48d8-89f0-532c516a8262
		fi
		echo	'Loading Linux linux-lts ...'
		linux	/boot/vmlinuz-linux-lts root=UUID=45b1a8e3-5fb4-48d8-89f0-532c516a8262 rw  loglevel=3 quiet
		echo	'Loading initial ramdisk ...'
		initrd	/boot/intel-ucode.img /boot/initramfs-linux-lts.img
	}
	menuentry 'Arch Linux, with Linux linux-lts (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-lts-fallback-45b1a8e3-5fb4-48d8-89f0-532c516a8262' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod ext2
		set root='hd1,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1  45b1a8e3-5fb4-48d8-89f0-532c516a8262
		else
		  search --no-floppy --fs-uuid --set=root 45b1a8e3-5fb4-48d8-89f0-532c516a8262
		fi
		echo	'Loading Linux linux-lts ...'
		linux	/boot/vmlinuz-linux-lts root=UUID=45b1a8e3-5fb4-48d8-89f0-532c516a8262 rw  loglevel=3 quiet
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initramfs-linux-lts-fallback.img
	}
	menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-45b1a8e3-5fb4-48d8-89f0-532c516a8262' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod ext2
		set root='hd1,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1  45b1a8e3-5fb4-48d8-89f0-532c516a8262
		else
		  search --no-floppy --fs-uuid --set=root 45b1a8e3-5fb4-48d8-89f0-532c516a8262
		fi
		echo	'Loading Linux linux ...'
		linux	/boot/vmlinuz-linux root=UUID=45b1a8e3-5fb4-48d8-89f0-532c516a8262 rw  loglevel=3 quiet
		echo	'Loading initial ramdisk ...'
		initrd	/boot/intel-ucode.img /boot/initramfs-linux.img
	}
	menuentry 'Arch Linux, with Linux linux (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-45b1a8e3-5fb4-48d8-89f0-532c516a8262' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod ext2
		set root='hd1,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1  45b1a8e3-5fb4-48d8-89f0-532c516a8262
		else
		  search --no-floppy --fs-uuid --set=root 45b1a8e3-5fb4-48d8-89f0-532c516a8262
		fi
		echo	'Loading Linux linux ...'
		linux	/boot/vmlinuz-linux root=UUID=45b1a8e3-5fb4-48d8-89f0-532c516a8262 rw  loglevel=3 quiet
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initramfs-linux-fallback.img
	}
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'void (on /dev/sda1)' --class void --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-2e233891-1937-4969-a34e-d052d1d84a1d' {
	insmod part_msdos
	insmod ext2
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
	else
	  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
	fi
	linux /boot/vmlinuz-4.18.17_1 root=/dev/sda1
	initrd /boot/initramfs-4.18.17_1.img
}
submenu 'Advanced options for void (on /dev/sda1)' $menuentry_id_option 'osprober-gnulinux-advanced-2e233891-1937-4969-a34e-d052d1d84a1d' {
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.18.17_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.18.17_1 root=/dev/sda1
		initrd /boot/initramfs-4.18.17_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.45_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.45_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.45_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.46_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.46_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.46_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.47_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.47_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.47_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.48_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.48_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.48_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.57_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.57_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.57_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.58_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.58_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.58_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.60_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.60_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.60_1.img
	}
	menuentry 'void (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.19.65_1--2e233891-1937-4969-a34e-d052d1d84a1d' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos1' --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  2e233891-1937-4969-a34e-d052d1d84a1d
		else
		  search --no-floppy --fs-uuid --set=root 2e233891-1937-4969-a34e-d052d1d84a1d
		fi
		linux /boot/vmlinuz-4.19.65_1 root=/dev/sda1
		initrd /boot/initramfs-4.19.65_1.img
	}
}

### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

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   Loading Linux 5.3.18-24.49-default ...
   error: symbol `grub_file_filters' not found.
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   error: symbol `grub_file_filters' not found.

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Как правильно задавать вопросы

Правильно сформулированный вопрос и его грамотное оформление способствует высокой вероятности получения достаточно содержательного и по существу ответа. Общая рекомендация по составлению тем: 1. Для начала воспользуйтесь поиском форума. 2. Укажите версию ОС вместе с разрядностью. Пример: LM 19.3 x64, LM Sarah x32 3. DE. Если вопрос касается двух, то через запятую. (xfce, KDE, cinnamon, mate) 4. Какое железо. (достаточно вывод inxi -Fxz в спойлере (как пользоваться спойлером смотрим здесь)) или же дать ссылку на hw-probe 5. Суть. Желательно с выводом консоли, логами. 6. Скрин. Просьба указывать 2, 3 и 4 независимо от того, имеет ли это отношение к вопросу или нет. Так же не забываем об общих правилах Как пример вот