Intel graphic ppa error after apt-get update

Question

how can i ignore this message?

W: GPG error: https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 56A3DEF863961D39
W: The repository 'https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Its from intel update gfx.

Solution 1

I managed to solve it for Ubuntu 16.04 and 16.10 by running following commands

wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-GROUP-KEY-ilg -O - | sudo apt-key add -
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg -O - | sudo apt-key add -
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-2 -O - | sudo apt-key add -
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-3 -O - | sudo apt-key add -
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-4 -O - | sudo apt-key add -

Solution 2

Try to add the key (replace 56A3DEF863961D39 with your missing key):

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 56A3DEF863961D39
sudo apt-get update

References and further reading:

• GPG error: The following signatures couldn't be verified because the public key is not available
• How do I fix the GPG error "NO_PUBKEY"?
• Invalid filename extension in apt sources.list

Solution 3

Open a terminal & run

wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-4 -O - | sudo apt-key add -

This will allow updates, you'll get the weak digest algorithm warning but it's just a warning at the moment. (in 16.04

Comments

[Pilot6]

It is better not to install anything from download.01.org. You will get only trouble.

[Boris Hamanov]

I agree with @Pilot6. Suggest you remove that repository. Cheers, Al

[kmonsoor]

@Pilot6 what do you suggest as an alternative ?

[ShuaibKunji]

Works but shows W: https://download.01.org/gfx/ubuntu/16.04/main/dists/xenial/I‌​nRelease: Signature by key 09D6EF97BFB38E916EF060E756A3DEF863961D39 uses weak digest algorithm (SHA1) at the end of apt update.

[Alex]

this should be the accepted answer.

[user262439]

Was not sure about this method, but it works! Thanks!

[saviour123]

This works definately.