Getting 'Failed to start remount root and kernel file systems' error

System is not booting into desktop. I guess the problem is in /var/lib/gdm. How can I recover /var/lib/gdm? I changed chown to setup bluetooth and after restarting it’s showing Failed to Start Remount Root and Kernel File Systems error. The default files of /var/lib/gdm folder has been replaced with some home directory folder.

to what?
From TTY reinstall gdm
sudo pacman -Syyu gdm

Probably that will also change the default Manjaro theme, so you might have to run:
sudo pacman -Syyu gdm manjaro-gdm-theme
then reboot the system.
systemctl reboot

Still the problem exist. I chowned to this chown gdm:gdm /var/lib/gdm/.config/pulse/client.conf

And do you have this lines in

autospawn = no
daemon-binary = /bin/true

or is empty ?

Maybe try again to run
sudo chown gdm:gdm /var/lib/gdm/.config/pulse/client.conf

Or remove that file to add it later, and see if gdm still fails. Have you checked the status of gdm?
systemctl status gdm
try to stop it and restart it
systemctl stop gdm
systemctl disable gdm
systemctl enable gdm --now

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I’ve booted successfully by doing this :
sudo pacman -Rcns gdm
sudo rm -rf /var/lib/gdm
sudo pacman -S gdm

But ‘Failed to start remount root and kernel file system’ error still persists.

Maybe you need to run:

e2fsck -f -v -C 0 -t /dev/sdaX

where X is the root partition

Also check the default mount options in fstab:

rw,noatime,nodelalloc,data=writeback # this is a NOT OK example

Try with:

defaults,noatime

for the root partition

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Everything is okay now. Turns out my fstab file was wrong. I had to change the UUID of root partition.

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