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I have two separate Linux installations on my system which I can access from grub. Is there a way to get back to the grub menu to access the other system without having to reboot?

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No. When grub boots the OS, grub is no more and you can't go back to grub from the OS as it's no longer running. Grub is not just another application, it can only be run at boot time of the computer.

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No, there's not. Once you're booted, there's no way to transfer control to GRUB.

Instead, you can look at User-Mode Linux and regular virtualization (VirtualBox, Xen, etc.).

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