I'll try to summarize the problem as clear as possible, previously I had a dual boot configuration with windows 10 and ubuntu 20.04LTS, since I have some problems with ubuntu i decided to try a new distro.
So I created an usb bootable pen drive with POP OS 21.04 (not nvidia version) and started the installer.
All was going fine until I had to partition manually the hard drive.
I deleted the old ubuntu partition and created a new one with: 500mIb fat32 bootloader (efi), a root partition (ext4 mounted in / with 90gb of space) and a swap partition.
The installation went fine, but when I boot up my machine some text appears which tells "GNU GRUB minimal BASH-like line editing is supported.....etc..", now the strange thing happens, if I type "exit" the system automatically leaves this state and a grub (i guess from popOS) appears, with both my partitions (and they both starts)
What I can think of is that this "gnu minimal bash-like" is the old ubuntu grub that hasn't been removed (in fact If I type "exit" a real selection appears), what do you suggest me to do?
(sorry if I miss typed something i'm not native english)
This is how I partitioned my hard drive: https://ibb.co/BVknwGD
Thanks to everyone in advance!
EDIT: I found what was the problem, when I unistalled the previous OS i assumed that it would delete his UEFI entry as well.
