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 a custom kernel using pre-configured drivers for bootloader, kernel, OpenGL, X.Org, Multimedia, etc. L4T is also available on other Tegra SOCs such as Tegra 2, Tegra 3, Tegra 4 and general Tegra K1. See the Official Linux4Tegra page for more info.

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*

Web browsers & Flash plugins for L4T

Most web browsers should work on L4T. More details are in the L4T Web Browsers page, including how to get Flash working such as for watching Youtube videos.