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I suggest starting a new thread, and post link to summary report from Boot-Repair.
Please copy & paste the pastebin link to the BootInfo summary report ( do not post report), do not run the auto fix...

I find path to be one of the issues.
As system is not yet mounted with grub, it is defaults as seen if using live installer, but not if you have booted and mounted using your own mount.

I have a...

I just installed Hirsute using UEFI & loopmount.

My configuration is a bit involved as I use a data partition and configfile into the ISO folder in the data partition. And in ISO folder I have a...

I use a configfile to boot the grub of my other Ubuntu installs.
And I now like labels over UUID, but you have to manage labels. When I re-install cosmic and reformat partition, it needs label...

With UEFI & gpt, only the ESP has asterisk which parted/gparted use to indicate the ESP.
Other tools like gdisk use different codes to indicate ESP. But with gpt only an ESP can or should have...

Whose grub2 are you using to boot.

I wanted to understand some of the differences with grub2, Ubuntu's grub2 and others.
I installed Fedora to a partition on sdb, and it actually let me install...

I wanted a unique entry in UEFI and boot menu description.
And the install of grub created both.
But grub is somewhere hard coded to only use /EFI/ubuntu/grub.cfg in the ESP to find the full...

Just did another 18.04 install to flash drive. First one was extremely slow. Not sure if flash drive or because not final version.
But new install overwrote (as expected) my /EFI/ubuntu in sda, my...

The address is a hex address of the error.

A search says it could be memory errors, grub errors, or you have one install as 32 bit and one 64 bit?
I have had totally different versions of grub2...

I only use ext4 on my full install or data partitions on flash drives.
All UEFI bootable installers must have a FAT32 formatted with boot flag to be the ESP. Normal installer is also the ESP as it...

When you look at drives in grub, is hd2 the correct drive?
When I have flash drive plugged in my hd0 becomes hd1, and I just edit in grub when it errors like that.

The menu entry looks correct,...

If you look at this the standard grub-install has the many option parameters.
man grub-install
info grub-install.

I have in my notes many versions of grub-install with different parameters, but...

It looks like Arch puts some boot files into the ESP?

This works for me (as long as flash drive is not plugged in and then drive is hd1)


menuentry "Ubuntu 18.04 Bionic (on /dev/sda4)" {
...

Why are you using gpt8, your boot stanza shows gpt7?

I think you are just using the full command for grub-install. With Ubuntu it is a script that assigns all the variables.

If all systems are not in same boot mode, you cannot boot from grub, only from UEFI.
Some systems may require you to also turn on/off UEFI or legacy/BIOS/CSM boot modes to match how installed system...

Your x is the partition number.

But because of my issues on drive changing depending on whether flash drive and/or external SSD are plugged in or not, the hdX, my hd0 may be hd1 or hd2 depending...

from my notes, I have renamed like this (really old note).

sudo nano -B /etc/default/grub
#GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_DISTRIBUTOR="Xubuntu-12.04-amd64...

Drives should match how once booted they become devices. Or hd0 should be sda.
But UEFI or BIOS may see drives differently. Maybe due to timing?
I thought drives were enumerated by UEFI/BIOS by...

I do have issues with my entires. I had USB SSD installed & flash drive and all my hd0, became hd2. I had to experiment to see which was correct.

This is my 40_custom:


fred@Xenial_z97:~$ cat...

It is one advantage of UEFI, that you in effect have the equivalent of many MBRs all on one drive.
Each folder in ESP can be a different boot entry. And that is where I wish I could rename different...

I have several copies of my ESP.
I copy most of it to the ESP on sdb.
I also copy my main working install to another folder in my ESP, so I have both the versions of grub & grub.cfg or anything...

That is the full grub command, I think other installs build the command by adding the parameters they want.
I have used that type of command to just install grub to a smaller flash drive with just...

I quickly learned to backup ESP - efi system partition.
Each install of Ubuntu overwrites the previous install in ESP. But it is only 3 lines as configfile to find full grub.cfg in your install. So...

+1 on Dennis N's comments.

I am still using 40_custom as you and Ranch Hand recommened way back when. And now I only have UEFI.

I turn off os-prober and use 40_custom to boot other installs....

Burg has not been supported for years. Best not to use it.
If using BIOS, this thread is your best source for grub configuration.

If you have a newer (last 5 years) hardware and it will be UEFI....