[Solved] /etc/default/grub: line 60: serial: command not found

Issue:- When i tried running the below command it resulted in the error
$ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
/etc/default/grub: line 60: serial: command not found

Cause:- You at some point made some mistake and run grub2-mkconfig -o /etc/default/grub which has overwritten your default grub file and when you are trying to create a grub file as mentioned above its erroring out in your old grub file

Resolution:- Manually edit and copy the following content in the grub file
vi /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

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