WetGeek I did that on an ACER Aspire 5 that my wife used a few years ago, but its native OS was Windows 10. Removing the Windows Boot Manager as a boot target was as easy as removing any disk. And the disks on that machine were inn no way hidden. But there's no apparent way to do that in this Windows 11 mode.
That's just not correct.
I installed Solus on two computers yesterday (a Dell Latitude 11-3180, running Windows 10, and a Dell Optiplex 7070 running Windows 11) during my annual rebuild process. In both cases, I created the Solus USB using Rufus on a different Windows 11 computer, entered BIOS and removed all boot managers on the target computer, and then installed Solus using the "destructive install" methods described in my rather long "how to" comment on "Windows dual boot (on seperate HDD"). I realize that you have no interest in dual-booting, but the issues and general process is common to both dual-OS booting and single-OS booting -- remove all bootloaders in BIOS and proceed.
WetGeek Thanks but as I mentioned, NEITHER Drive 0 NOR Drive 1 is visible to a Solus installer. They're invisible outside of Windows or the UEFI settings. The installer can't install over the primary drive, because it can't see it.
Here are some things I would look at:
(1) Is either disk (the primary or the secondary) encrypted? Windows 10/11 Pro/Enterprise encrypts disks with BitLocker by default, but I am assuming that you are running Windows 11 Home. Windows 11 Home has a somewhat similar protection method ("Device Encryption") but I don't think that it is enabled by default. If Acer's Windows 11 installation has Device Encryption or something similar enabled that might be why the drives are recognized in BIOS but not visible to you Solus USB.
(2) I haven't used an Acer computer in over a decade, but I have yet to see a computer BIOS that doesn't have a way to remove and reorder boot loaders in the BIOS. BIOS precedes the OS, so Windows is almost certainly not the block, because Windows doesn't have the ability to modify the BIOS other than to add the Windows Boot Manager. Are you absolutely sure that you If the Acer BIOS does not allow you to remove bootloaders, then you need to look at what Acer is doing to lock up the BIOS in some strange way.
(3) You might want to figure out what drive M2/PCIe/NVMe/SATA controller is being used by the computer and check whether the kernel supports that controller.
(4) Do you have the ability (e.g. external drive cases for M2 and/or SSD) to remove the disks from your Acer, plug them into another computer and wipe and reinitialize the disks? If you, you might try that to see if you can get to a clean drive.
(5) You might consider downloading the Windows Media Creation Tool for Windows 11 and doing a clean "destructive" reinstall of Windows 11 on the Acer. If Acer is doing something like encrypting on the sly, that should clear the problem.
I hope you find an answer on the Acer forum.