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It was in 2012 that Microsoft required vendors to install Windows 8 in UEFI boot mode to gpt partitioned drive.
Most Windows 7 installs were to MBR(msdos) partition drives in BIOS boot mode.
...

Post link to summary report, so we can see issue.

You can chroot into your system. And reinstall grub or make other repairs.
UEFI chroot, must include ESP - efi system partition...

My Dell Laptop had major issues & I had to return it for new motherboard. (Twice)
First time both Windows & Ubuntu kept working.
But second time I think Dell forgot to put the old Product key back...

Does not grub entry get added when installing?
Or if installed does not os-prober find other installs?
sudo os-prober

examples from cavfan...

Grub uses the same driver as UEFI/BIOS since system is not yet mounted.
Often issue then is a setting in UEFI/BIOS for USB support or keyboard/mouse settings.

HP - escape + F9 for UEFI boot menu,...

Still no grub in sda's MBR??
Installer should have put grub into MBR with a BIOS install.

Do you have Internet connected when running Boot-Repair?
Are you running Boot-Repair from Xubuntu live...

Many brands of AC1200. If router it is compatible with every Internet Wi-Fi device.
Or is this an USB adapter to connect to your router.

Best to use Ubuntu live installer and see if it works in...

How new of an HP?
Is this the latest UEFI firmware for your system?


There is a bug somewhere. Not sure if Boot-Repair, grub, kernel or modprobe.


Note sure if older systems had efivars in...

You are not showing grub installed to MBR of sda?
With gpt you have to have bios_grub partition, and you have it. So did you get an error message on grub install?

If drive was gpt, was Windows...

While I would expect Ubuntu to install on that system, perhaps a lighter weight flavor?
https://ubuntu.com/download/flavours
Light weight flavors:
Lubuntu, Xubuntu, Ubuntu MATE, Budgie
Flavors of...

Have not seen it.
https://help.ubuntu.com/community/Grub2/CustomMenus
https://help.ubuntu.com/community/Grub2/Displays

But grub is both a boot loader and a boot manager/menu.
You can use rEFInd...

I had to return my Dell for a new motherboard. I think they did not update UEFI with old Microsoft product key.
My Kubuntu install worked without issue, but Windows would not boot. Tried every...

Do you have good backups? Both Window & Ubuntu?

Can you not do Something Else and choose (change) the existing / (root) partition for new /?
And if separate /home, also choose that during...

I am not having any issue with Kubuntu 24.04

fred@z170-noble:~$ grub-install --version
grub-install (GRUB) 2.12-1ubuntu7
fred@z170-noble:~$ lsb_release -a
No LSB modules are available. ...

I do not like dd as we see too many users specify wrong device & destroy data on drive they really want to keep. And of course those users never have backups.

Many have suggested all of these:...

Have you updated UEFI and SSD firmware to latest available?
Even new models may have an update.

New systems typically need new kernel & driers that are only in newer distributions.
So testing...

You have grub, but if only one install, menu should not normally appear.
If abnormal shutdown or some issue menu may appear so you can use recovery mode to make repairs.
Or you can change grub...

Do not know Mint and what installer it now uses. If still the Ubiquity installer you have to use one of the work arounds. But gpt partitioning in advance and making sure you have an ESP on external...

From this web page I go to Kubuntu and then daily live, pending. Other versions similar but same file name.
https://cdimage.ubuntu.com/

I copy noble final to oracular and zsync. only 9%...

I have both.
But always keep /home (only) in / (root) so user settings are on fastest drive and always available.
I do keep a large data partition where main working install of Kubuntu is on NVMe...

As a test, I just installed KDE Neon along side of my Kubuntu install on my larger external SSD.
It was almost the same, but they "forgot" the snaps. :)
This may be my go to for the future, still...

I do not think Boot-Repair knows about 32 bit UEFI on 64 bit systems.
I thought you just had to manually copy the 32 bit UEFI files.
...

Grub may not boot Windows if hibernated/fast startup on. Fast startup also sets hibernation flag. Or if Windows needs chkdsk or other repairs. You probably need a Windows repair/recovery drive or the...

Since Windows is in old BIOS boot on MBR(msdos) partitioned drive, your old install of Ubuntu must have been in old BIOS boot mode.
You do not have to reinstall to convert your UEFI install to BIOS...

With my Kubuntu install I do a bit of tuning for faster boot. It is Kubuntu but configuration files are mostly the same.
It then boots in about 1/3 of the time.

After most of the tuning
...