No GPG keys error when installing CUDA6.5 on Ubuntu 14.04 x84_64

Hi,

I recently bought the Jetson TK1 board and I managed to install CUDA6.5 on it to do native compilation. However, I also want to do cross compilation. To that end, I am trying to do a cross-build installation on my Ubuntu 14.04 x86 64 bit host machine. More precisely, I am trying to perform the cross-build installation on a Ubuntu guest virtualbox I have running on my Windows host.

I would like to add that the GPU on my host machine is not CUDA capable. But I don’t think this matters because I only intend to compile CUDA programs on the host machine, not run them.

The steps I am following are in section 5.1 of the CUDA setup and installation guide: https://devtalk.nvidia.com/default/topic/803524/embedded-systems/anyone-have-a-guide-for-cloning-jetson-tk1-without-the-jetpack-development-pack-/

When I try to run sudo dpkg -i cuda-repo-ubuntu1404_6.5-14_amd64.deb, I get the following error:

auggy@auggy-VirtualBox:~/Downloads$ sudo dpkg -i cuda-repo-ubuntu1404_6.5-14_amd64.deb
Selecting previously unselected package cuda-repo-ubuntu1404.
(Reading database … 163905 files and directories currently installed.)
Preparing to unpack cuda-repo-ubuntu1404_6.5-14_amd64.deb …
Unpacking cuda-repo-ubuntu1404 (6.5-14) …
Setting up cuda-repo-ubuntu1404 (6.5-14) …
gpg: no valid OpenPGP data found.
Failed to add GPGKEY at http://cuda-repo/repos/GPGKEY to apt keys.

I am pretty sure I am using the correct operating system:

auggy@auggy-VirtualBox:~/Downloads$ uname -m && cat /etc/*release
x86_64
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION=“Ubuntu 14.04.2 LTS”
NAME=“Ubuntu”

I would really appreciate some help on this issue. I am fairly new to Ubuntu so please bear with me.

Thanks!
VERSION=“14.04.2 LTS, Trusty Tahr”
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME=“Ubuntu 14.04.2 LTS”
VERSION_ID=“14.04”
HOME_URL=“http://www.ubuntu.com/
SUPPORT_URL=“http://help.ubuntu.com/
BUG_REPORT_URL=“http://bugs.launchpad.net/ubuntu/