My Asus T100TAF can’t see installed Ubuntu 18.10

I installed Ubuntu 18.10 on my Asus T100 TAF. Pure installation, no other OS. After clicking last command “restart system”, system starts but from USB again, with menu: try Ubuntu, install Ubuntu, and so on…

When i tried to enter setup before boot, there were no boot options, like there was never ever system before. When i remove USB after installation, only bios starts. When I restore “secure boot – enabled” – ther is no Ubuntu marks of life.

Initially there was Win10 preinstalled by manufacturer. Obviously i was fed up with this software and its’ spontanous behaviour.