You won't find update-grub command on all the distributions. So, how do you update grub then? Here's what you can do.

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Learn how to fix the 'update-grub' command not found error in Linux. Also, find out how to customize the GRUB bootloader on Linux.

[Solved] update-grub command not found Error in Linux

Why do you see 'update-grub' command not found error?

How to fix the update-grub command not found error