Hello again and sorry for my long absence to the forum. I've had a hdd crash and my linux os (secondary on the laptop) disappeared, so I was unable to read any messages.
I didn't figured out any new steps to make Ubuntu Touch working on my Nexus 10. It looks like there is some part missing in all the tutorials . I will reanimate my Ubuntu biulding environment to come back to the topic and will share my progress.

@Yougo Hi, no success still. I'm running out of options, tried many Times and many ways building from scratch from different sources.
It's bootlooping after flashing or rebooting during uploading files in recovery mode.

Hi,
I'm new to this forum and I'm seeking advice.
Since a week I'm trying to install and boot Ubuntu Touch on my Nexus 10 (manta). The only method that worked for me was:
$ ubuntu-device-flash touch --channel=ubuntu-touch/devel/ubuntu --bootstrap
from the system-image.ubuntu.com.
It's very old version and many things are not working. There is no possibility to update it to the latest version of UT.
I've tried all the versions from ubports with no success. Always tthe same scenario - after pushing files in recovery and rebooting to flash, crossed chip appears after 2-3 seconds and that's it.
I have also tried to build manually current version by myself, using Ubuntu on my desktop and the official tutorial taken from Ubuntu. All went smooth, i've flashed newly compiled boot and recovery images, rebooted to recovery (with nice ubuntu background this time) and stuck on rootstock-touch-install. After long wait and reboot, my Nexus 10 is ib bootloop with Android logo only.
Maybe I'm a noob in linux world but if anyone could be so kind to advice me on the right steps it would be nice. Is there no hope for running more recent Ubuntu Touch than the 2nd version from official server?