Steve Si

Setting Rufus to MBR does not prevent it from UEFI booting and then installing UEFI boot files and making GPT partitions on target disk.

Why not look at the panther log files and then you can trace the error?

It seems there is a problem with Legacy install when using Ventoy or grubfm or Easy2Boot(I tested with VBox 5), however **it does work when legacy booting to Easy2Boot and...

The Atlas ISO contains two copies of AutoUnattend.xml \AutoUnattendl.xml and inside \sources\boot.wim as \autounattend.xml If both these XML files are removed then the install works using Ventoy in Legacy Mode....

Well, you would need to experiment. But in any case you would need to edit the iso. My first guess is that it is the locale settings as the required...

A recent Windows 10 update KB4535680 writes a hash key into the DBx (blacklist) database. So if you recently ran Windows 10 on that system, it will have installed that...

The original poster did have windows as the system booted to bitlocker. Your issue is probably you did not enroll the hash key using mok manager as instructed on the...

Can you supply screenshot of the error message or all and exact words displayed?

archlinux-2021.11.01-x86_64.iso is latest UEFI64 - Works under VBOX 5 - ventoy v1.0.70 - MBR NTFS 

Try making drive with GPT option instead of MBR