@numbqq I flashed over USB-C cable this image (edge-ubuntu-18.04-server-linux-4.4-fenix-1.1.1-220725-emmc.img from your dl), which boots fine if normal Power Adapter is used (if usb-co to laptop usb-c, there is constant loop.
Any way seems with old Ubuntu Server there are emmc problems. Full boot log can be found here Password: khadas.
root@Khadas:~# dmesg | grep mmc2
[ 5.442185] mmc_host mmc2: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 5.502995] mmc2: queuing unknown CIS tuple 0x80 (2 bytes)
[ 5.504675] mmc2: queuing unknown CIS tuple 0x80 (3 bytes)
[ 5.506298] mmc2: queuing unknown CIS tuple 0x80 (3 bytes)
[ 5.509239] mmc2: queuing unknown CIS tuple 0x80 (7 bytes)
[ 5.512911] mmc2: queuing unknown CIS tuple 0x81 (9 bytes)
[ 5.567424] mmc_host mmc2: Bus speed (slot 0) = 150000000Hz (slot req 150000000Hz, actual 150000000HZ div = 0)
[ 5.824790] mmc2: queuing unknown CIS tuple 0x91 (3 bytes)
[ 5.824818] mmc2: new ultra high speed SDR104 SDIO card at address 0001
[ 7.103361] mmc2:mmc host rescan start!
[ 14.662917] mmc_host mmc2: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 14.681858] mmc_host mmc2: Bus speed (slot 0) = 200000Hz (slot req 200000Hz, actual 200000HZ div = 0)
[ 14.736801] mmc2: queuing unknown CIS tuple 0x80 (2 bytes)
[ 14.740143] mmc2: queuing unknown CIS tuple 0x80 (3 bytes)
[ 14.743168] mmc2: queuing unknown CIS tuple 0x80 (3 bytes)
[ 14.749108] mmc2: queuing unknown CIS tuple 0x80 (7 bytes)
[ 14.755903] mmc2: queuing unknown CIS tuple 0x81 (9 bytes)
[ 14.863948] mmc_host mmc2: Bus speed (slot 0) = 150000000Hz (slot req 150000000Hz, actual 150000000HZ div = 0)
root@Khadas:~# free
total used free shared buff/cache available
Mem: 3870484 85832 3654604 13744 130048 3739488
Swap: 1048560 0 1048560
root@Khadas:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 378M 5.6M 373M 2% /run
/dev/mmcblk1p7 29G 1.7G 27G 6% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
tmpfs 1.9G 0 1.9G 0% /tmp
tmpfs 378M 0 378M 0% /run/user/0
root@Khadas:~#