I recently set up a dual boot with Linux Mint and Kubuntu because I wanted to try out KDE Plasma. However, after installing Kubuntu, I've noticed that the GRUB menu has changed, and I can no longer see Linux Mint listed. I ran the command `sudo update-grub` but it didn't recognize Linux Mint, and `os-prober` didn't work for me either. I also checked `efibootmgr`, but it shows only Kubuntu along with a few others like Windows and Realtek PXE. I attempted to boot from the firmware bootloader, but that only lists Kubuntu as well. I can still access the Linux Mint partition and its files just fine. Any advice on how to resolve this?
3 Answers
It sounds like there might have been an issue with your EFI partition. Check your Mint partition's `/etc/fstab` to see if the EFI partition is mounted as `/boot` or `/boot/efi`. If it's mounted incorrectly, comment that line out, chroot into Mint to reinstall the kernel, and run the Kubuntu GRUB’s os-prober again. You might also want to uninstall GRUB from Mint's package manager since having it can cause conflicts.
When dual booting with two Linux distros, the one you install last usually takes over the boot. To make Mint appear in the GRUB menu of Kubuntu, ensure `os-prober` is enabled and run `sudo update-grub` and `sudo grub-install /dev/sda` or your specific disk. If you want to get back the Mint GRUB, just boot into Mint using Super Grub 2 and reinstall GRUB. When you switch back, rinse and repeat for both systems.
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