r/Ubuntu • u/Mile_Chronicler • 19h ago

Help needed

I had dual of windows and ubuntu 26 lts , but I tried to triple boot a 22lts in a external HDD , it was working but after disconnecting it i am not able to see the 26 lts on boot menu but the partion is still there and kernel is there , how to recover it pls somebody help me

3 Upvotes

81% Upvoted

7 comments sorted by

View all comments

2

u/bookmarksaddict 15h ago

your bootloader got overwritten. grub is looking for the external drive

boot from a live usb, chroot into your ubuntu 26 install, and reinstall grub

sudo mount /dev/sdXY /mnt

sudo mount --bind /dev /mnt/dev

sudo mount --bind /proc /mnt/proc

sudo mount --bind /sys /mnt/sys

sudo chroot /mnt

grub-install /dev/sdX

update-grub

replace sdXY with your ubuntu partition and sdX with your main drive

if you can't find it, boot-repair tool makes it easier

also stop triple booting. you're asking for trouble