You can download it from Ubuntu official website
Or use the Ubuntu image we provide
Here we are using the ubuntu-22.04.2-desktop-amd64.iso image.
Delete all emmc partitions. To delete a partition, select the corresponding partition with the mouse and click the minus sign below.
Create the emmc partition. Here we only need to create two partitions, one is the efl partition and the root file partition. One is used to boot into the Ubuntu system, and the other is used to mount the new Ubuntu system. Creation method: Select the free space partition with the mouse, click the plus sign, and configure it.
Create the efl partition. Here we configure the size to 512MB and select EFI System Partition as the partition format.
Create a root file partition, select Ext4 journaling file system as the partition format, and select / as the mount point.