113

When I run the command:

sudo apt-get update

I got this following warning: 

There is no public key available for the following key IDs: 1397BC53640DB551

This is the only warning I got and I do not get any Error.

How I can fix it and what the key 1397BC53640DB551 is all about?

muru
  • 193,181
  • 53
  • 473
  • 722
Marcellinov
  • 3,339
  • 3
  • 15
  • 23
  • 1
    For reviewers: There are already 2 votes on https://askubuntu.com/questions/766205/update-information-is-outdated-16-04 being a duplicate of this one. Let's not create a loop! – guntbert May 05 '16 at 18:40
  • Can you please include the full output of `apt-get update` in your question? – David Foerster May 06 '16 at 13:19
  • 1
    You can check this [SO](http://askubuntu.com/questions/308760/w-gpg-error-http-ppa-launchpad-net-precise-release-the-following-signatures/) thread for solution. Link to [related site](http://opensourceforgeeks.blogspot.in/2013/04/w-gpg-error-httpppalaunchpadnet-precise.html) – Aniket Thakur Nov 01 '16 at 09:09

2 Answers2

170

I resolved running:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1397BC53640DB551

The command above download the missing key using the hexadecimal numbers given in the error (1397BC53640DB551) with apt-key. After running apt-key to download the missing PUBKEY, any packages from that repositories will be considered trusted.

It seems to be a known problem in chromium that is being worked on (check here). They are working to remove SHA1 encryption (link).

Another possible workarounds that have been posted on reddit

wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -

Looking at this, seems that Google now has two keys, and the old one will probably be discontinued along with SHA1.

Marcellinov
  • 3,339
  • 3
  • 15
  • 23
  • 2
    The first one timed out for me (keyserver.ubuntu.com) so I had to use the second one from Google. – Ryan H. Sep 04 '16 at 17:42
  • 1
    If you're in an IPv6 only server, you can use `pool.sks-keyservers.net` instead of `keyserver.ubuntu.com` – James Z Aug 28 '17 at 18:11
  • Working fine when I can't add inkscape trunk in this tutorial https://inkscape.org/es/gallery/item/6641/view/ The error appear: "W: GPG error: http://ppa.launchpad.net/inkscape.dev/trunk/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9DA4BD18B9A06DE3 " Then I Add with this: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9DA4BD18B9A06DE3 – Indacochea Wachín Feb 21 '19 at 03:54
  • For me this command worked: `apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 1397BC53640DB551` – elif Aug 18 '19 at 17:59
46

Correct command line is:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1397BC53640DB551
Marcellinov
  • 3,339
  • 3
  • 15
  • 23
iFred
  • 560
  • 3
  • 6