Can't boot Ventoy for Xubuntu on brand new HP

[Liam Proven]

On Sun, 19 Dec 2021 at 21:55, MR ZenWiz <mrzenwiz at gmail.com> wrote:
>
> Secure Boot Violation
> Invalid signature detected. Check Secure Boot Policy in Setup.

That is the problem.

> 1. This is exactly the same USB flash drive I used to reinstall
> Xubuntu 20.04 in her old Dell with a new-ish SSD I installed (WAY
> easier installation with the manual, to Dell's credit).  It has the
> UEFI config setup on the flash drive - the Dell also has secure boot
> enabled in UEFI. This works perfectly.

Red herring, I think.
>
> I tried to disable the secure boot in the BIOS, but it's so picky
> about that that it requires numerous steps that, frankly, are too much
> of a pain for such a slow operation,

Tough. That is the answer. Do it.

Here is what I had to do to make my new work Dell dual boot:

[1] Disable secure boot. Reboot. Check Windows starts OK.

[2] Turn off Bitlocker in Win10. Decrypt whole hard disk. Reboot.
Check Windows starts OK.

[3] Turn off RAID mode in the BIOS.

This is tricky because Windows then won't boot. Here is how to bypass that:
https://askubuntu.com/questions/1208384/help-with-dual-boot-windows-10-and-changing-from-raid-to-ahci-dell-g3-3590

Check Windows starts OK in normal mode.

[4] Shrink Windows partition on SSD using Windows disk manager.
Reboot. Check Windows starts OK. Run CHKDSK /F to check for errors.
Reboot. Check Windows starts OK.

[5] Upgrade to latest Ventoy for UEFI compatibility

[6] Boot Mint, make new partitions, install
I needed this workaround:
https://github.com/ventoy/Ventoy/issues/965

[7] Check Windows starts OK. Install updates.
[8] Reboot into Mint. Install updates. Reboot. Check.
[9] Reboot into Windows. Check Windows starts OK.

It is getting harder. You need to do the legwork.

"This is too slow, I want a quick way" is not going to work.

-- 
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