Jetson TK1 cannot access extlinux/extlinux.conf : Permission Denied

Dear all, I am totally new to Linux and ssh, but I am following this tutorial:

and done exactly as it says.

I managed to flash the TK1 and access it but when I came to access and edit /boot/extlinux/extlinux.conf, I got a permission denied message. I also tried to access and edit extlinux.conf from root of the tegra-ubuntu but no success at all.

Can anyone explain if I am doing something wrong, or if I missed something.

Thanks in advance.

That file is owned by root, thus you must have privileges of user root to edit it. If you want to gain root privileges from user “ubuntu” (“ubuntu” is an administrator, else this wouldn’t work) you can use “sudo”. To run a single command with sudo, using “ls” as an example:

sudo ls /boot/extlinux/extlinux.conf

To run multiple commands as root:

sudo -s
ls /boot/extlinux
ls -l /boot/extlinux/extlinux.conf