Tegra/Downstream SW/Linux4Tegra

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Linux4Tegra (L4T) is NVIDIA's distribution that ships by default on devices such as the Jetson TK1. L4T is basically Ubuntu 14.04 with pre-configured drivers for bootloader, kernel, OpenGL, X.Org, Multimedia, etc.

Updating Linux4Tegra repo sources

Running "sudo apt-get update" simply makes sure your repo sources are up-to-date, and thus is always safe to perform and in fact recommended that you perform it regularly (say atleast once per month).

Upgrading Linux4Tegra packages

On the other hand, "sudo apt-get upgrade" will upgrade various packages to the most recent version, and this will give you more recent software but potentially cause some package conflicts or broken software. This section lists some issues people have noticed with performing a "sudo apt-get upgrade":

Totem media player shows videos as green, no matter what format

This can be fixed by running this:

sudo apt-get remove gstreamer1.0-plugins-bad*