Can't find manjaro in grub

Repository      : core
Name            : mkinitcpio
Version         : 31-2.0
Description     : Modular initramfs image creation utility
Architecture    : any
URL             : https://github.com/archlinux/mkinitcpio
Licenses        : GPL
Groups          : None
Provides        : initramfs
Depends On      : awk  mkinitcpio-busybox>=1.19.4-2  kmod>=30  util-linux>=2.23  libarchive  coreutils  bash  binutils
                  diffutils  findutils  grep  filesystem>=2011.10-1  gzip  systemd
Optional Deps   : xz: Use lzma or xz compression for the initramfs image
                  bzip2: Use bzip2 compression for the initramfs image
                  lzop: Use lzo compression for the initramfs image
                  lz4: Use lz4 compression for the initramfs image
                  zstd: Use zstd compression for the initramfs image
                  mkinitcpio-nfs-utils: Support for root filesystem on NFS
Required By     : hibernator  linux419  linux510  linux515  linux515-rt  linux518  linux518-rt  linux519  linux519-rt
                  linux54  linux60  manjaro-system  manjaro-tools-iso-git  mkinitcpio-openswap  mkinitcpio-systemd-tool
                  nitrux-minimal-git
Optional For    : tpm2-totp
Conflicts With  : None
Replaces        : None
Download Size   : 55.83 KiB
Installed Size  : 114.73 KiB
Packager        : Philip M
Build Date      : Tue Jul 5 13:06:41 2022
MD5 Sum         : 1a7733bb618829a8e0cf9603d4cd0334
SHA-256 Sum     : 3c3a2401d00312225b5248b6a6e6ecbf8d80a695b3726e7fc0efc860c50acf9b
Signatures      : CAA6A59611C7F07E

so lets resintall all those deps:

pacman -S kmod gawk libmikmod mkinitcpio-busybox util-linux util-linux-libs lib32-util-linux libarchive coreutils binutils bash diffutils findutils grep filesystem gzip systemd --overwrite '*'

then run again:
mkinitcpio -P

[manjaro /]# mkinitcpio -P
==> ERROR: No presets found in /etc/mkinitcpio.d

did you run this?:

I did.

ok that was fast … the last thing that i can think of is to reinstall all your packages:
pacman-mirrors --fasttrack 5 && pacman -Syyu
then reinstall them:

pacman -Qqn | pacman --overwrite=* -S -

when its done rerun again:
mkinitcpio -P

I got some error.

(14/44) Install DKMS modules
==> ERROR: Missing 5.15.65-1-MANJARO kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing bin kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing desktopfs-pkgs.txt kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing usr kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing media kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing etc kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing opt kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing proc kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing var kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing snap kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing dev kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing rootfs-pkgs.txt kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing run kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing mnt kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing lost+found kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing tmp kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing home kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing lib kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing srv kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing root kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing lib64 kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing boot kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing sys kernel headers for module vboxhost/6.1.38_OSE.
==> ERROR: Missing sbin kernel headers for module vboxhost/6.1.38_OSE.

so the command was aborted or it continue to reinstalling?

It continued to reinstalling. And mkinitcpio failed.

ok so if it continue then let it continue … do you use virtualbox?

I used to use it. Now it doesn’t matter anymore.

and the reinstalling is still continuing?

The reinstalling is done.

no its not done, thats not possible… it couldnt reinstall your whole system in such short time …
post output from:
pacman -Qs 'virtualbox|dkms'

[manjaro /]# pacman -Qs 'virtualbox|dkms'
local/dkms 3.0.6-1
    Dynamic Kernel Modules System
local/linux515 5.15.65-1
    The Linux515 kernel and modules
local/virtualbox-host-dkms 6.1.38-1
    VirtualBox Host kernel modules sources

so remove this:
pacman -R virtualbox-host-dkms
if there are no errors run the reinstall again:
pacman -Qqn | pacman --overwrite=* -S -

1963 packages reinstalled.

are you kidding me ?
were there any errors?
did the mkinitcpio works?

Only

Error connecting: Could not connect: No such file or directory
error: command failed to execute correctly

No.

[manjaro /]# mkinitcpio -P
==> ERROR: No presets found in /etc/mkinitcpio.d

well its not ‘only’ the reinstall didnt happen … post the whole output …