Dear Xiangjun,

The Nektar apt key is available at http://www.nektar.info/nektar-apt.gpg

Some details are provided on the downloads page (https://www.nektar.info/downloads/) in the "Package repositories" section but to summarise, you should be able to download the key file, then run "apt-key add nektar-apt.gpg" (I think this may require sudo).

Once you have done this, "sudo apt-get update" should work and you'll be able to install the Nektar++ packages on Ubuntu Bionic using "sudo apt-get install nektar++"

Kind regards,

Jeremy

On 20 Jun 2020, at 13:52, shan xiangjun <x_j_shan@outlook.com> wrote:
 
Dear Nektar:
 
I want to install Nektar++ on Win10-WSL: Ubuntu 18.04 using the pre-compiled
packages, but I encountered a problem.
 
After
Code:
sudo apt-get update
 
I get the following:
 
Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Hit:3 http://archive.ubuntu.com/ubuntu bionic InRelease
Get:4 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:1 https://www.nektar.info/ubuntu-bionic bionic InRelease [6114 B]
Get:5 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Err:1 https://www.nektar.info/ubuntu-bionic bionic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DB5E71FF7AC99B37
Reading package lists... Done
W: GPG error: https://www.nektar.info/ubuntu-bionic bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DB5E71FF7AC99B37
E: The repository 'http://www.nektar.info/ubuntu-bionic bionic InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
 
 
I have tried the following:
Using different servers such as the following:
 
code:
gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv DB5E71FF7AC99B37
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys DB5E71FF7AC99B37
sudo apt-key adv --hkp://keys.gnupg.net--recv-keys DB5E71FF7AC99B37
gpg --keyserver hkp://pgpkeys.mit.edu --recv DB5E71FF7AC99B37
 
 
But, no good results.The key could not be found.Examples are listed below:
 
Executing: /tmp/apt-key-gpghome.IoDko6URV5/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys DB5E71FF7AC99B37
gpg: keyserver receive failed: No data
 
gpg: no valid OpenPGP data found.
 
Have tried to see if key exists with command:
code:
 
apt-key list
 
but it is not listed there.
 
/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-archive.gpg
------------------------------------------------------
pub   rsa4096 2012-05-11 [SC]
      790B C727 7767 219C 42C8  6F93 3B4F E6AC C0B2 1F32
uid           [ unknown] Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>
 
/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
------------------------------------------------------
pub   rsa4096 2012-05-11 [SC]
      8439 38DF 228D 22F7 B374  2BC0 D94A A3F0 EFE2 1092
uid           [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>
 
/etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg
------------------------------------------------------
pub   rsa4096 2018-09-17 [SC]
      F6EC B376 2474 EDA9 D21B  7022 8719 20D1 991B C93C
uid           [ unknown] Ubuntu Archive Automatic Signing Key (2018) <ftpmaster@ubuntu.com>
 
Regards,
Xiangjun
 
 
 
As you can see, many avenues explored with no good results.
Looking for some help, please
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