Unfortunately there is no way to install and run Ubuntu on a Samsung Smart TV.

What we can do however is to attach a small dedicated Ubuntu computer with an HDMI interface to the TV. This could be any box ranging from a tiny Raspberry Pi box to a full blown media PC.

In our home we built an own Ubuntu PC based on a cheap mini-ITX board with integrated CPU/GPU. This box is more than suitable for occasional browsing but is mostly used for audio and video streaming of media stored on our Ubuntu desktop in the same network.