In my case its stucks on plymouth.. but with sound :)
Maby problem in firmware version - i use latest A11.\
Another problem is:
"Ubuntu 16.04-based Ubuntu Touch has been long deprecated and unmaintained"
It must be everising works, except nfc & HWAcceleration
./build.sh -b workdir
./build/prepare-fake-ota.sh out/device_caprip_usrmerge.tar.xz ota
./build/system-image-from-ota.sh ota/ubuntu_command images\
All your firmware files are in 'images/' folder.
'boot.img' and 'dtbo.img' flash as it named.
'system.img' not needed.
'rootfs.img' must be placed as '/data/ubuntu.img'..
one problem is that /data partition must be decripted, but you can always just 'format data' from custom recovery and:
adb push rootfs.img /data/ubuntu.img