Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//usr/share/glib-2.0/schemas/org.gnome.Disks.gschema.xml

 <?xml version="1.0" encoding="UTF-8"?>
<schemalist>
  <schema id="org.gnome.Disks" path="/org/gnome/Disks/" gettext-domain="gnome-disk-utility">
    <key name="image-dir-uri" type="s">
      <default>''</default>
      <summary>Default location for the Create/Restore disk image dialogs</summary>
      <description>Default location for the Create/Restore disk image dialogs. If blank the ~/Documents folder is used.</description>
    </key>
  </schema>
</schemalist>