Im trying to install ubuntu onto my chromebook(lenovo 400e 2nd gen)

as the title suggests im trying to install ubuntu onto my chromebook(lenovo 400e 2nd gen) but whenever i trya sudo command it come us with this message - sudo: The “no new privileges” flag is set, which prevents sudo from running as root.
sudo: If sudo is running in a container, you may need to adjust the container configuration to disable the flag.

im new to linux and have no clue how to fix it can anyone please help?

You have to use VT-2, as described in Flashing Custom Firmware | Chrultrabook Docs