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Drivers would not be on a drive, but on the installer, or would need to be added to the installer.

You should also make sure you have latest firmware for both UEFI & NVMe drives.

I have never...

Windows 7??
That was normally old BIOS/MBR configuration. Systems since 2012 are UEFI with gpt partitioning.
With old BIOS/MBR installs you only have one MBR (per drive).
So if you have two...

I use Kubuntu and no snaps.
I am using about 16GB of a 30GB partition.

Since Ubuntu now defaults to use a lot of snaps, I have seen users with 20Gb of snaps only. So now larger / is often...

Still running Kubuntu with no snaps.

I used this to install Firefox.
You also have to reset priorities as shown or it will reinstall the Firefox snap....

That sounds more like what I did back before grub2. And grub2 became the standard in 2010.
Systems since 2012 are UEFI, and UEFI boot is different than the old BIOS boot, also.

Best just to keep...

Not sure what you mean?

You have /boot, which is not required for most desktops, but is used with servers & LVM when full drive encryption is specified. Full drive encryption means not dual boot,...

I use rEFInd on a tiny old too small for anything else flash drive for emergency boot. Saved me a couple of times.

But I see a newer version is available.
https://sourceforge.net/projects/refind/...

Signed driver is UEFI Secure boot.
Windows may need a driver for NVMe drives with secure boot.

Google found this:

My grub with commented (#) lines excluded.



fred@Z170-jammy:~$ cat /etc/default/grub | grep -v '#'
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=3 ...

You are not changing quiet splash, you are changing it to blank per 1fallan's suggestion. Which is good.
But I prefer to use these settings over the defaults. noplymounth is an alternate to the ""....

Many UEFI can update from UEFI directly if file extracted into FAT32 partition which UEFI can read.
Some also update from a DOS bootable flash drive.

If nvme not installed you have to installed...

Your UEFI firmware version number looks low or older.
Best to make sure you have latest firmware for both UEFI and NVMe drive.
You can directly see that:
sudo lshw | grep -m 1 -A 5 "*-firmware" & ...

You ran Boot-Repair report when in BIOS boot mode. You need to run in UEFI boot mode.
Boot-Mode setting in UEFI/BIOS is default for installed system. You have to choose mode when booting live...

I thought fd0 was floppy drive?
Some may have floppy drive configured in UEFI/BIOS even when it does not exist. So error is that UEFI/BIOS said you have floppy, but installer cannot find it to know...

Wubi is long obsolete.
For users that are primarily Windows users, there is WSL a limited Ubuntu install inside Windows.
https://learn.microsoft.com/en-us/windows/wsl/install
A full virtual...

renamed noble-desktop-amd64.iso from a day or two ago, in my ISO folder & ran zsync
Had minor update to final.
Note zsync only worked with http not https.

...

My Dell which is UEFI only, installed with RAID on using VMD driver which previously I did not know about.
I installed Kubuntu 22.04, but will be installing 24.04 soon. I have several test installs...

What version of Ubuntu?
Older version of Ubuntu and flavors use Ubiquity installer with this bug for any install to second or external drive.
...

You are showing the automount that clicking on it from a gui app like file browser gives, not a correct mount in fstab. It defaults to the label you added to partition. I do suggest labels,...

You can see fstab
cat /etc/fstab

You have to use your UUID and create a mount point.
Check UUID:
lsblkt -f
sudo mkdir/Media_H # just to use MAFoElffen's example.
sudoedit /etc/fstab

More...

If using 22.04 Kubuntu note that this bug still applies as it uses the Ubiquity installer which defaults to first drive.
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1396379

Be sure...

You should always be able to boot an external USB flash drive for repair/recovery.
Can you not open UEFI boot options?

Did you install ESP on external drive. It also then should be bootable from...

You can only chown or chmod Linux formatted partitions, not Windows partitions like FAT32 or NTFS.
You set defaults by how you muount partition. Typically still owned by root, but with open...

I really like my external SSD. My first one was the M.2 SSD from 2017 desktop build when I wanted a newer larger drive. I liked it so much I bought a another M.2 drive and USB adapater, so have two...

If this issue is solved best to change status to solved. You can do that from first post editing and then at top menu.

And if new issue start a new thread.