[SOLVED] Dual boot Ubuntu will not boot after install

[Jamlev]

I've installed Ubuntu 19.10 in a partition on an SSD alongside Windows 10. The installation went fine until I tried to reboot.

The PC now just loops and keeps restarting, black screen for a few seconds and reboot.

I've been into the BIOS and tried changing the boot priority for all three options but it still wont boot either into Ubuntu or Windows.

Also tried disabling Secure Boot and CSM but it makes no diff. It will boot to the Ubuntu USB stick though when the SSD is unplugged.

Mainboard is an ASUS TUF B450. Drive is a Kingston 500GB SSD.

 

[Alabalcho]

What you probably "see" is the GRUB trying to display its menu. Try pressing up / down arrow while booting, to see whether a menu will be displayed.

Your best option for now is to boot Windows install media, and "repair boot".

 

[Jamlev]

Ok, no there is no menu, just a black screen for a few seconds then it reboots into the same loop.

 

[Alabalcho]

When you boot off USB install media, there's a menu.

 

[Jamlev]

I know the USB boots but it wont boot to the SSD I just installed it on.

 

[Ap0sGR]

Seems like GRUB is corrupted or not installed. It's an easy fix, start any distro on live CD and do the following:

Open terminal, login as root:
sudo -i

find out your linux disk :
fdisk -l

mount it:
mount /dev/sdaX /mnt

Recover:
grub-install --root-directory=/mnt /dev/sda

Original link

 

[FossFox]

can you get to bios? disable windows boot option in it and use ubuntu one. youll be able to select os from grub every boot or itll auto select windows.