Trying to boot the live 64-bit system from a Ventoy hdd:
After the kernel was loaded a Fatal error occurred: Could not find antiX/linuxfs
Edit july 30th:
Tried again on a different system with GA-MA770-DS3 (rev. 1.0) mobo and with different SSD (Samsung 850 EVO instead of Crucial BX500) to install MX Linux on, but booting from the same Ventoy hdd.
This time the live system booted quickly, without any long delay after the kernel was loaded. Will try later on the previous system again.
Installation, to a MBR partition, on a SSD 850 EVO and reboot went also without any problems. No long delays, as with MX19 on a SSD BX500!
MX21 seems to be a little faster than MX19.
I tried again on the first system, again without success: MX19.3, MX19.4 and MX21 Beta cannot be loaded with the same failure: Could not find antiX/linuxfs
This system is a HP Pavilion m8180nl-a, which i use already a long time and mostly without any serious problems.
The live systems of several other Linux distributions then MX can be loaded without any problem from the same Ventoy external hdd.
The HP computer is known for its limitations in the BIOS addressing too large partitions.
I tried exfat partitions of 127GB and 100GB. Still too big perhaps?
Machine:
Type: Desktop Mobo: ASUSTeK model: Berkeley v: 1.xx
serial: <superuser required> BIOS: American Megatrends v: 5.04
date: 06/23/2007
CPU:
Info: Quad Core model: Intel Core2 Quad bits: 64 type: MCP cache:
L2: 4 MiB
Speed: 1596 MHz min/max: 1596/2394 MHz Core speeds (MHz): 1: 1596 2: 1602
3: 1596 4: 1596
Final update

.
I updated the Ventoy disk from 1.0.37 to the latest 1.0.47 version of Ventoy and now MX Live can be booted again from the Ventoy disk, connected to my HP system.
MX21 Beta is running fine. So no problems anymore sofar.