Migration from MBR to GPT fails

[ralf]

Hi,



on old hardware I made a Ventoy USB stick using MBR. This Vento USB stick worked.
The first partition was an ext4 partition holding

xubuntu-20.04.1-desktop-amd64.iso
xubuntu-20.04.1-desktop-pers1.dat
ventoy/ventoy.json

the content of ventoy/ventoy.json was

Code:

{
    "persistence": [
        {
            "image": "/xubuntu-20.04.1-desktop-amd64.iso",
            "backend": "/xubuntu-20.04.1-desktop-pers1.dat"
        }
    ]
}

There was a third partition formatted as fat32, holding data to share.

Now I try to make a Ventoy USB stick using GPT on new hardware. Actually it's the same USB stick.

I tried in 1001 way, never touched the second partition, but whatever I tried so far doesn't work. The closest to something working was done this way:
I used gparted to create the GPT and to create an 16380 MiB sized ext4 partition. Behind the ext4 partition were 13619 MiB left unallocated.
Then I run

Code:

ventoy -i -r 13554 -g -n /dev/sdf

Now I have got a first 16 GiB sized ext4 partition and a second 32 MiB fat16 partition and left are unallocated 13.27 GiB.
I copied


xubuntu-20.04.1-desktop-amd64.iso
xubuntu-20.04.1-desktop-pers1.dat
ventoy/ventoy.json


to the ext4 partition, the files that were used by the MBR USB stick. I have done nothing to the second partition. When I boot I get the Ventoy menu with the Ventoy wallpaper claiming that no ISOs are available.
Other attempts without the "-n" option were even more worse. I got a black screen, the output was something similar to "invalid Ventoy".

Code:

# pacman -Q ventoy-bin 
ventoy-bin 1.0.91-1
# ventoy -l /dev/sdf 

**********************************************
      Ventoy: 1.0.91  x86_64
      longpanda admin@ventoy.net
      https://www.ventoy.net
**********************************************

Ventoy Version in Disk: 1.0.91
Disk Partition Style  : GPT
Secure Boot Support   : YES

Regards,
Ralf