Correct me if I am wrong but I think TK1 is armhf (32-bit arm architecture).
If that be the case, make sure you have Ubuntu16.04 installed on your device.
To download FlytOS and its dependencies, run the following script in TK1’s terminal:
sudo sh -c ‘curl -sSL https://downloads.flytbase.com/flytos/install/flytOS_new.sh | bash’
I cooked up this script for you, and I don’t have TK1 to test it on. If it fails, share flytos_installation_log.txt file created in your $HOME directory and I would debug it.