After modifying some parameters in /etc/default/grub, I get the following errors when trying to update the grub:
grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
cut: invalid option -- 'f'
I am not sure where I have to look for troubleshooting this. I have recreated my whole Grub environment from scratch but to no avail.
Do you have something in the grub.d directory?
Have you tried reinstalling grub? To be clear, I mean the package grub.
Please show the file! 
I do. All the “default” stuff. Haven’t changed anything in there.
ls /etc/grub.d
00_header 10_linux 20_linux_xen 30_os-prober 30_uefi-firmware 40_custom 41_custom README
Yes.
# GRUB boot loader configuration
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet"
GRUB_CMDLINE_LINUX=""
# Preload both GPT and MBR modules so that they are not missed
GRUB_PRELOAD_MODULES="part_gpt part_msdos"
# Uncomment to enable booting from LUKS encrypted devices
#GRUB_ENABLE_CRYPTODISK=y
# Set to 'countdown' or 'hidden' to change timeout behavior,
# press ESC key to display menu.
GRUB_TIMEOUT_STYLE=menu
# Uncomment to use basic console
GRUB_TERMINAL_INPUT=console
# Uncomment to disable graphical terminal
#GRUB_TERMINAL_OUTPUT=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=auto
# Uncomment to allow the kernel use the same resolution used by grub
GRUB_GFXPAYLOAD_LINUX=keep
# Uncomment if you want GRUB to pass to the Linux kernel the old parameter
# format "root=/dev/xxx" instead of "root=/dev/disk/by-uuid/xxx"
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
GRUB_DISABLE_RECOVERY=true
# Uncomment and set to the desired menu colors. Used by normal and wallpaper
# modes only. Entries specified as foreground/background.
#GRUB_COLOR_NORMAL="light-blue/black"
#GRUB_COLOR_HIGHLIGHT="light-cyan/blue"
# Uncomment one of them for the gfx desired, a image background or a gfxtheme
#GRUB_BACKGROUND="/path/to/wallpaper"
#GRUB_THEME="/path/to/gfxtheme"
# Uncomment to get a beep at GRUB start
#GRUB_INIT_TUNE="480 440 1"
# Uncomment to make GRUB remember the last selection. This requires
# setting 'GRUB_DEFAULT=saved' above.
#GRUB_SAVEDEFAULT=true
# Uncomment to disable submenus in boot menu
#GRUB_DISABLE_SUBMENU=y
edit-- @dalto, @manuel, this is happening in one of my Arch install. If you think I should be posting on Arch forum, I’ll do so.
Never mind folks. I had thought to do a new install with systemd-boot this weekend. Perhaps this is the sign I was waiting for 
. So I am going to wipe out the whole disk now and build it up from scratch. Though it bothers me that just out of the blue I got that “error message”.
Hi,
I have tried to reinstall my system with systemd-boot but I don’t seem to get it to work.
There is something I miss but I cannot pinpoint it. I suspect there is something in /boot/loader/loader.conf or /boot/loader/entries/arch-gnome.conf which is not correctly specified. Here is some info:
parted -l
Model: Samsung SSD 970 EVO 500GB (nvme)
Disk /dev/nvme0n1: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 1075MB 1074MB fat32 boot, esp
2 1075MB 492GB 490GB btrfs
3 492GB 500GB 8590MB linux-swap(v1) swap
/boot/loader/loader.conf
timeout 5
#console-mode keep
default arch-gnome.conf
editor yes
auto-firmware 1
/boot/loader/entries/arch-gnome.conf
title Arch Linux
linux /vmlinuz-linux-zen
initrd /intel-ucode.image
initrd /initramfs-linux-zen.img
options rw rootflags=subvol=@arch-gnome-root
/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/nvme0n1p1
UUID=BCD6-459F /boot vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro 0 2
# /dev/nvme0n1p2
UUID=1d9646ea-0edf-423b-85a7-88a429c6314b / btrfs rw,relatime,compress=lzo,ssd,discard=async,space_cache,subvolid=256,subvol=/@arch-gnome-root 0 0
# /dev/nvme0n1p2
UUID=1d9646ea-0edf-423b-85a7-88a429c6314b /home btrfs rw,relatime,compress=lzo,ssd,discard=async,space_cache,subvolid=257,subvol=/@arch-gnome-home 0 0
I would really appreciate if you could point me to the right direction. I am stuck here and can’t go forward not finding what is wrong
Suffix for intel-ucode should be img…
You need to add the root, typically something like root=UUID=1d9646ea-0edf-423b-85a7-88a429c6314b
one thing you shouldnt have is
editor yes
This would allow someone to gain root access without a password
otherwise your options look a bit off as @dalto pointed out
No need for this:
rootflags=subvol=@arch-gnome-root
in addition to root=UUID= ?
You need both. root= tells it where the root partition is. rootflags=subvol= tells it which subvolume to use.
You are just great!
I will make those changes and get back to you with the result.
Thank you!
Good luck! 
you got this, just some slight configuration issues is all. 
Never before have I been happier to be greeted by a black TTY!
Thank you so much guys, you are wonderful!
I’ve got some connectivity issues to sort out. Hopefully I can manage on my own.
