Debian 9 stretch-backports signature couldn't be verified












0















I'm new to Linux world and trying to install certbot on my Debian 9 server on Google compute engine VM.



Here's what I have done so far:
To add backports repository, I have edit the sources.list as:



sudo nano /etc/apt/sources.list


Then add this line at the very bottom of the file:



deb http://ftp.debian.org/debian stretch-backports main


After that when I run this command:



sudo apt update


it return this error:




Reading package lists... Done



W: GPG error: http://ftp.debian.org/debian stretch-backports



InRelease: The following signatures couldn't be verified because the
public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY
7638D0442B90D010



E: The repository 'http://ftp.debian.org/debian
stretch-backports 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.











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    0















    I'm new to Linux world and trying to install certbot on my Debian 9 server on Google compute engine VM.



    Here's what I have done so far:
    To add backports repository, I have edit the sources.list as:



    sudo nano /etc/apt/sources.list


    Then add this line at the very bottom of the file:



    deb http://ftp.debian.org/debian stretch-backports main


    After that when I run this command:



    sudo apt update


    it return this error:




    Reading package lists... Done



    W: GPG error: http://ftp.debian.org/debian stretch-backports



    InRelease: The following signatures couldn't be verified because the
    public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY
    7638D0442B90D010



    E: The repository 'http://ftp.debian.org/debian
    stretch-backports 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.











    share|improve this question







    New contributor




    Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      0












      0








      0








      I'm new to Linux world and trying to install certbot on my Debian 9 server on Google compute engine VM.



      Here's what I have done so far:
      To add backports repository, I have edit the sources.list as:



      sudo nano /etc/apt/sources.list


      Then add this line at the very bottom of the file:



      deb http://ftp.debian.org/debian stretch-backports main


      After that when I run this command:



      sudo apt update


      it return this error:




      Reading package lists... Done



      W: GPG error: http://ftp.debian.org/debian stretch-backports



      InRelease: The following signatures couldn't be verified because the
      public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY
      7638D0442B90D010



      E: The repository 'http://ftp.debian.org/debian
      stretch-backports 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.











      share|improve this question







      New contributor




      Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I'm new to Linux world and trying to install certbot on my Debian 9 server on Google compute engine VM.



      Here's what I have done so far:
      To add backports repository, I have edit the sources.list as:



      sudo nano /etc/apt/sources.list


      Then add this line at the very bottom of the file:



      deb http://ftp.debian.org/debian stretch-backports main


      After that when I run this command:



      sudo apt update


      it return this error:




      Reading package lists... Done



      W: GPG error: http://ftp.debian.org/debian stretch-backports



      InRelease: The following signatures couldn't be verified because the
      public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY
      7638D0442B90D010



      E: The repository 'http://ftp.debian.org/debian
      stretch-backports 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.








      debian backports google-cloud certbot






      share|improve this question







      New contributor




      Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






      New contributor




      Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 20 mins ago









      Abdul RehmanAbdul Rehman

      1011




      1011




      New contributor




      Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      New contributor





      Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Abdul Rehman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















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