Finally, I solved this problem. Thanks for the author give me the thinking light!

https://forum.xda-developers.com/meizu-pro-5/development/tool-ubuntu-touch-installer-t3469304

I used the flash script because I find it code can be used any files, so nice.
And also, This command is the key I get the 'latest' files about Pro 5

https://ubports.com/zh_CN/blog/ubports-1/post/ubuntu-touch-ota-13-release-3720

sudo system-image-cli -v -p 0 --progress dots

Though it prompt Hash failed , But I find the files link. Some tar.xz like device***.tar.xz keyring***.tar.xz ubports****.tar.xz and version-*.tar.xz.

So we only need to use twrp to install the ubuntu-touch-installer_v0.1b.zip script ( these 5 files must in the same folder and no other files) wait it succeed and reboot it. enjoy

And now I got 16.04 OTA-13

@Lakotaubp Okay. I solved the problem now.

Finally, I solved this problem. Thanks for the author give me the thinking light!

https://forum.xda-developers.com/meizu-pro-5/development/tool-ubuntu-touch-installer-t3469304

I used the flash script because I find it code can be used any files, so nice.
And also, This command is the key I get the 'latest' files about Pro 5

https://ubports.com/zh_CN/blog/ubports-1/post/ubuntu-touch-ota-13-release-3720

sudo system-image-cli -v -p 0 --progress dots

Though it prompt Hash failed , But I find the files link. Some tar.xz like device***.tar.xz keyring***.tar.xz ubports****.tar.xz and version-*.tar.xz.

So we only need to use twrp to install the ubuntu-touch-installer_v0.1b.zip script ( these 5 files must in the same folder and no other files) wait it succeed and reboot it. enjoy

And now I got 16.04 OTA-13

Hi buddy. I have a Mizu Pro 5 and I restore it to 16.04 from a backup in TWRP 3.0.

But I find it cannot update anymore, always prompt failed. The OS number now is 2018-W34/3.

Do you guys have good idea about it?

If it can be update by computer with command to flash it? The ubports installer is not working.