[SOLVED] persistence difficulty

[longpanda]

When you in ventoy boot menu,  press c to enter grub shell  and run  vt_dump_persistence  and  help to send me the output.

i mounted persisitence.img

losetup  /dev/loop0 persistence.img

i get : bash-5.0# lsblk -f  /dev/loop0
NAME  FSTYPE LABEL     UUID                                 FSAVAIL FSUSE% MOUNTPOINT
loop0 ext4   casper-rw 54a35dfa-1bb3-4f28-bbde-ef2cab798445               
bash-5.0#

iso boots using new release from grub i get , see image

basically i can get grub options and an output for vt_dump_menu but nothing for vt_dump_persistence

If  vt_dump_persistence print nothing, that means there is some error in ventoy.json (syntax error or file path error).

You can use some online tool  like  http://json.parser.online.fr  or  http://json.cn/ 
just copy the json context to the left and see the right whether there is some syntax error.

For your ventoy.json

{
 
  "control": [
        { "VTOY_DEFAULT_MENU_MODE": "1" },
        { "VTOY_FILT_DOT_UNDERSCORE_FILE": "1" },
        { "VTOY_DEFAULT_SEARCH_ROOT": "/ISO/" }
    ]  <---------- here miss a  comma
    "persistence" : [
        {
            "image": "/ISO/linuxmint-19.3-xfce-64bit.iso",
            "backend": "persistence.img"
        }
    ],  <---------- There shouldn't be a comma here
}