Editing grub

[natchezjohn]

I have Mint on sda1 and ubuntu on sda6. Grub is on sda.

I want to replace ubuntu but fear that doing so will put the new os as first on the log in.

If so I'll need to edit the grub file BUT I DON'T KNOW HOW TO ACCESS IT. Once I do I'll probably be back here for assistance in doing so.
But I gotta find it first. How do I do that?

[mank_in]

to avoid the pain , you can try install Grub Customizer

But if you want to change manually, you can use terminal :

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 grep menuentry /boot/grub/grub.cfg


You will see something like this ( i use my grub for sample ) :

Linux Mint 14 Cinnamon 32-bit, 3.5.0-17-generic (/dev/sda3)'
Linux Mint 14 Cinnamon 32-bit, 3.5.0-17-generic (/dev/sda3) -- recovery mode
Memory test (memtest86+)
Memory test (memtest86+, serial console 115200)

the first one is menuentry 0 , so Memory test (memtest86+, serial console 115200) is menuentry 4

executed:
Cinnamon :

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sudo gedit /etc/default/grub

MATE:

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sudo pluma /etc/default/grub

change :
GRUB_DEFAULT=0
to whatever menuentry you choose, if ubuntu is menuentry 5 and LM is 0 change 5 to 0
save it.
execute :

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sudo update-grub

[natchezjohn]

I see. Looks like something even I could do.
But using Grub Customizer would be even easier. Do it work on mint? I assume so as mint is a ubunto derivative.
Thank you,
John

[mank_in]

works on ubuntu usually for for Mint too

[natchezjohn]

Thank you very much!!