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I have a fedora + manjaro installation. Although grub2 shows all the boot options, but when manjaro is selected it gives the infamous kernel panic:

kernel panic-not syncing: VFS:unable to mount root fs on unknown block(0,0)

After going though several arch forums I found that if I press e at the grub2 and edit the last line of manjaro boot sequence from

initrdefi /boot/intel-ucode.img

to

initrdefi /boot/intel-ucode.img /boot/initramfs-4.9-x86_64.img

It boots into manjaro.

Naturally, I opened fedora, did a grub2-update to get the grub.cfg file and made the required changes in it, but those changes are not getting reflected into the grub2 boot screen (i.e I have to manually add /boot/initramfs-4.9-x86_64.img to boot into manjaro, otherwise it gives a kernal panic)

How would I make the changes in the grub.cfg permanent?
Additionally, I read somewhere that we should not make changes to grub.cfg as it'll change if the kernal is upgraded. What's the best course of action here?

Thanks.

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have the same issue using the fedora 25 grub2 to boot both: fedora and Manjaro.

what i did:

WARNING, YOU CAN RREALLY SRCREW THE CONFIG, SO BE CAREFUL!

As root:

vi /boot/grub2/grub.cfg

it opens the text editor so you can add the line you need, wich can be found in the /boot from the other distros. you will need the initramfs info. use taht and add it as you did in de grub

initrdefi /boot/intel-ucode.img

/boot/initramfs-4.9-x86_64.img <--- this is the line you must add.

it worked for me until the Majaro with kernel 4.11 and fedora 26 aside. im struggling a little now

Note: you must repeat the drill only if the manjaro kernel changes (if you want to boot into the version with the new kernel.)

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