How to Install grub on POP OS 20.04

First and foremost update and upgrade your POP OS if it is newly installed.

Open up terminal and enter:

sudo apt update -y && sudo apt upgrade -y

[jacci@Jacci ~]$ sudo apt update -y && sudo apt upgrade -y
Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu focal-security InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease   
Hit:4 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease 
Hit:5 http://apt.pop-os.org/proprietary focal InRelease
Hit:6 http://ppa.launchpad.net/system76/pop/ubuntu focal InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
64 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed 

...

Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
Processing triggers for dbus (1.12.16-2ubuntu2) ...
Setting up gnome-shell (3.36.2-1ubuntu1~20.04.1pop1~1589984649~20.04~645af9b) ...
Setting up gnome-shell-extension-prefs (3.36.2-1ubuntu1~20.04.1pop1~1589984649~20.04~645af9b) ...
jacci@pop-os:~$ 



After updating, it is time to install grub and grub-customizer for actually modifying/generating grub configuration file visually. Type in the following command:

sudo apt install grub-efi grub2-common grub-customizer

jacci@pop-os:~$ sudo apt install grub-efi grub2-common grub-customizer
Reading package lists... Done
Building dependency tree       
Reading state information... Done
grub2-common is already the newest version (2.04-1ubuntu26).
The following packages were automatically installed and are no longer required:
  grub-pc-bin ubuntu-system-service
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  efibootmgr grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed hwinfo libhd21 libx86emu2
The following packages will be REMOVED:
  grub-gfxpayload-lists grub-pc
The following NEW packages will be installed:
  efibootmgr grub-customizer grub-efi grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed hwinfo libhd21 libx86emu2
0 upgraded, 9 newly installed, 2 to remove and 0 not upgraded.
Need to get 2,724 kB of archives.
After this operation, 18.7 MB of additional disk space will be used.
Do you want to continue? [Y/n] y

...

Setting up grub-efi (2.04-1ubuntu26) ...
Setting up grub-efi-amd64-signed (1.142+2.04-1ubuntu26) ...
Setting up grub-customizer (5.1.0-2) ...
Processing triggers for desktop-file-utils (0.24-1ubuntu2) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for libc-bin (2.31-0ubuntu9) ...
Processing triggers for man-db (2.9.1-1) ...
jacci@pop-os:~$ 

To actually install grub as a boot loader it need to installed through a grub-install command:

sudo grub-install

jacci@pop-os:~$ sudo grub-install
Installing for x86_64-efi platform.
Installation finished. No error reported.
jacci@pop-os:~$ 

Due to a bad install of grub, it is needed to copy grub.efi to the to the appropriate folder and overwrite. As follows.

sudo cp /boot/grub/x86_64-efi/grub.efi /boot/efi/EFI/pop/grubx64.efi

There is no output of this command. Move on to Step 3.

Currently the grub file has basically nothing inside and its needed to be generated via grub-customizer

• Open grub-customizer from applications/activities.
• After opening grub-customizer click Change Environment
• In the OUTPUT_FIle change the value to:

/boot/efi/EFI/pop/grub.cfg

• Select save this configuration
• Click Apply
• Reboot your system

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