Can only boot using fallback initramfs option

First of all, kudos on the classiest linux distro I have seen (and I’ve been a exclusive linux user for over a decade, and worked on at least 25 distros).
I am a happy user of AL. Some time ago, I suddenly was unable to log in using the standard boot option for AL. It would get stuck with “kernel panic.” However, the fallback initramfs option always works, and that is how I am going about it. Wanted to learn more about the system using this issue as a focus. If anyone can guide, it would be great. Thanks in advance!

Check that the booted kernel version matches the modules:

uname -r
ls /usr/lib/modules

Also check the installed kernel version and the kernel image itself:

pacman -Q linux
file /boot/vmlinuz-linux

This presumes that you are using the vanilla kernel version.

Thanks. I did all of these, and the answer is the same on all. I am running 5.7.5-arch1-1. Anything else I should try?

Update your system to pull in the latest kernel version, the initramfs will be rebuilt when that happens.

pacman -Syu

If the system still won’t boot the non-fallback option then please post the output of

grep -v '^#\|^$' /etc/mkinitcpio.conf

I did as you asked, and still same problem. Here is the output you had asked for:

MODULES=()
BINARIES=()
FILES=()
HOOKS=(base udev autodetect modconf block  filesystems shutdown keyboard fsck)

Show /boot/grub/grub.cfg

Here it is; sorry it is rather long.

# 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$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod ext2
set root='hd0,msdos2'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos2' --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2  17437118-925c-40b0-8d54-b0f18b6d36bd
else
  search --no-floppy --fs-uuid --set=root 17437118-925c-40b0-8d54-b0f18b6d36bd
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 'ArchLabs Linux' --class archlabs --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-17437118-925c-40b0-8d54-b0f18b6d36bd' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='hd0,msdos2'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos2' --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2  17437118-925c-40b0-8d54-b0f18b6d36bd
	else
	  search --no-floppy --fs-uuid --set=root 17437118-925c-40b0-8d54-b0f18b6d36bd
	fi
	echo	'Loading Linux linux ...'
	linux	/boot/vmlinuz-linux root=UUID=17437118-925c-40b0-8d54-b0f18b6d36bd rw  
	echo	'Loading initial ramdisk ...'
	initrd	/boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-linux.img
}
submenu 'Advanced options for ArchLabs Linux' $menuentry_id_option 'gnulinux-advanced-17437118-925c-40b0-8d54-b0f18b6d36bd' {
	menuentry 'ArchLabs Linux, with Linux linux' --class archlabs --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-17437118-925c-40b0-8d54-b0f18b6d36bd' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos2'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos2' --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2  17437118-925c-40b0-8d54-b0f18b6d36bd
		else
		  search --no-floppy --fs-uuid --set=root 17437118-925c-40b0-8d54-b0f18b6d36bd
		fi
		echo	'Loading Linux linux ...'
		linux	/boot/vmlinuz-linux root=UUID=17437118-925c-40b0-8d54-b0f18b6d36bd rw  
		echo	'Loading initial ramdisk ...'
		initrd	/boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-linux.img
	}
	menuentry 'ArchLabs Linux, with Linux linux (fallback initramfs)' --class archlabs --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-17437118-925c-40b0-8d54-b0f18b6d36bd' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos2'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,msdos2' --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2  17437118-925c-40b0-8d54-b0f18b6d36bd
		else
		  search --no-floppy --fs-uuid --set=root 17437118-925c-40b0-8d54-b0f18b6d36bd
		fi
		echo	'Loading Linux linux ...'
		linux	/boot/vmlinuz-linux root=UUID=17437118-925c-40b0-8d54-b0f18b6d36bd rw  
		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 'Ubuntu 19.04 (19.04) (on /dev/sda1)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-f9b9de94-2335-4477-a02e-630f83a7b77e' {
	insmod part_msdos
	insmod ext2
	set root='hd0,msdos1'
	if [ x$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  f9b9de94-2335-4477-a02e-630f83a7b77e
	else
	  search --no-floppy --fs-uuid --set=root f9b9de94-2335-4477-a02e-630f83a7b77e
	fi
	linux /boot/vmlinuz-5.0.0-13-generic root=UUID=f9b9de94-2335-4477-a02e-630f83a7b77e ro quiet splash $vt_handoff
	initrd /boot/initrd.img-5.0.0-13-generic
}
submenu 'Advanced options for Ubuntu 19.04 (19.04) (on /dev/sda1)' $menuentry_id_option 'osprober-gnulinux-advanced-f9b9de94-2335-4477-a02e-630f83a7b77e' {
	menuentry 'Ubuntu (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-5.0.0-13-generic--f9b9de94-2335-4477-a02e-630f83a7b77e' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$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  f9b9de94-2335-4477-a02e-630f83a7b77e
		else
		  search --no-floppy --fs-uuid --set=root f9b9de94-2335-4477-a02e-630f83a7b77e
		fi
		linux /boot/vmlinuz-5.0.0-13-generic root=UUID=f9b9de94-2335-4477-a02e-630f83a7b77e ro quiet splash $vt_handoff
		initrd /boot/initrd.img-5.0.0-13-generic
	}
	menuentry 'Ubuntu, with Linux 5.0.0-13-generic (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-5.0.0-13-generic--f9b9de94-2335-4477-a02e-630f83a7b77e' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$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  f9b9de94-2335-4477-a02e-630f83a7b77e
		else
		  search --no-floppy --fs-uuid --set=root f9b9de94-2335-4477-a02e-630f83a7b77e
		fi
		linux /boot/vmlinuz-5.0.0-13-generic root=UUID=f9b9de94-2335-4477-a02e-630f83a7b77e ro quiet splash $vt_handoff
		initrd /boot/initrd.img-5.0.0-13-generic
	}
	menuentry 'Ubuntu, with Linux 5.0.0-13-generic (recovery mode) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-5.0.0-13-generic--f9b9de94-2335-4477-a02e-630f83a7b77e' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$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  f9b9de94-2335-4477-a02e-630f83a7b77e
		else
		  search --no-floppy --fs-uuid --set=root f9b9de94-2335-4477-a02e-630f83a7b77e
		fi
		linux /boot/vmlinuz-5.0.0-13-generic root=UUID=f9b9de94-2335-4477-a02e-630f83a7b77e ro recovery nomodeset
		initrd /boot/initrd.img-5.0.0-13-generic
	}
	menuentry 'Ubuntu, with Linux 5.0.0-11-generic (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-5.0.0-11-generic--f9b9de94-2335-4477-a02e-630f83a7b77e' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$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  f9b9de94-2335-4477-a02e-630f83a7b77e
		else
		  search --no-floppy --fs-uuid --set=root f9b9de94-2335-4477-a02e-630f83a7b77e
		fi
		linux /boot/vmlinuz-5.0.0-11-generic root=UUID=f9b9de94-2335-4477-a02e-630f83a7b77e ro quiet splash $vt_handoff
		initrd /boot/initrd.img-5.0.0-11-generic
	}
	menuentry 'Ubuntu, with Linux 5.0.0-11-generic (recovery mode) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-5.0.0-11-generic--f9b9de94-2335-4477-a02e-630f83a7b77e' {
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos1'
		if [ x$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  f9b9de94-2335-4477-a02e-630f83a7b77e
		else
		  search --no-floppy --fs-uuid --set=root f9b9de94-2335-4477-a02e-630f83a7b77e
		fi
		linux /boot/vmlinuz-5.0.0-11-generic root=UUID=f9b9de94-2335-4477-a02e-630f83a7b77e ro recovery nomodeset
		initrd /boot/initrd.img-5.0.0-11-generic
	}
}

### 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 ###

### BEGIN /etc/grub.d/60_memtest86+ ###
if [ "${grub_platform}" == "pc" ]; then
    menuentry "Memory Tester (memtest86+)" --class memtest86 --class gnu --class tool {
        search --fs-uuid --no-floppy --set=root --hint-ieee1275='ieee1275//disk@0,msdos2' --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2  17437118-925c-40b0-8d54-b0f18b6d36bd
        linux16 /boot/memtest86+/memtest.bin 
    }
fi
### END /etc/grub.d/60_memtest86+ ###

I should also add: the point at which the boot hangs is “end kernel panic: failed to mount VFS …” It enters kernel panic earlier, then ends KP, and immediately hangs.

initrd /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-linux.img >> initrd /boot/initramfs-linux.img

Just to clarify: you want me to replace the text before the “>>” sign by the text after, right. I will do that and reboot.

Exactly

I did it Mr. Slav. It did not work. Same problem: it hangs at the “end kernel panic” same as earlier. Should I try something else? Thanks.

Also, just to be clear: that pattern occurred twice in that file, and I changed both occurrences.

And You didn’t do it after updating the kernel in ubuntu

No, I didn’t do anything after updating the Ubuntu partition. Do you want me to change that pattern even in the ubuntu partition?

No.It is necessary to reinstall grub from AL

I see. How can I do that? Does that not happen automatically when I did update? I can do it: just don’t know how exactly to…

#grub-instsll /dev/sda
#grub-mkconfig /boot/grub/grub.cfg

Just making sure: when I do grub-install /dev/sda, it says “error, cannot delete /boot/grub/i386-pc/linux16.mod”: permission denied.
I can do it sudo, but just want to make sure that is what you want me to do. Will do it when you give OK.

The # symbol assumes that you are root