lost grub in ubuntu 16.04 /ubuntu 20.04 dual boot

[bustamanteguevara]

Hi all,

I had ubuntu 16.04 in my DELL, and I installed a new partition with ubuntu 20.04, to keep the functionality of the old system until I can fully migrate to 20.04.

I started the old 16.04 system, and now I cannot come back to the 20.04 one. It is hard to access the grub menu, and when I access it, it doesn't have the option to go to ubuntu 20.04.

Are there any suggestions?

Things I have tried:

- go to the boot menu (there is not an option to go to the second partition)
- edit the /etc/default/grub file and "update-grub" after.

Cheers