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When I type sudo apt update I get this response: 

Get:1 https://dl.winehq.org/wine-builds/ubuntu bionic InRelease [6,242 B]
Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease                   
Hit:3 http://dl.google.com/linux/chrome/deb stable Release                     
Err:1 https://dl.winehq.org/wine-builds/ubuntu bionic InRelease                
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
Hit:5 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu bionic InRelease    
Hit:6 http://archive.ubuntu.com/ubuntu bionic InRelease                        
Hit:7 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:8 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:9 http://archive.ubuntu.com/ubuntu bionic-security InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://dl.winehq.org/wine-builds/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
W: Failed to fetch https://dl.winehq.org/wine-builds/ubuntu/dists/bionic/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
W: Some index files failed to download. They have been ignored, or old ones used instead.

I've try to use sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key 76F1A20FF987672F to fix it, but noting is fixed:

gpg:keyserver receive failed: No data

How can I fix this? I uninstalled wine last week; have I not fully uninstalled it?

Zanna
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Sam Lo
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    Check the repository list by sudo cat /etc/apt/sources.list | grep winehq for unnessesary wine repo entry and disable the winehq line by adding a # before it and then re-run sudo apt update And if you want to fix wine, you can follow this https://askubuntu.com/q/1103240/505225 or you have to fix your wine key by wget -nc https://dl.winehq.org/wine-builds/winehq.key && sudo apt-key add winehq.key && sudo apt update – Pavel Sayekat Dec 20 '18 at 12:52
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    when i type 'sudo cat /etc/apt/sources.list | grep winehq' he give me this respond 'deb https://dl.winehq.org/wine-builds/ubuntu/ bionic main

    deb-src https://dl.winehq.org/wine-builds/ubuntu/ bionic main'

     – Sam Lo Dec 20 '18 at 15:36
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    type sudo nano /etc/apt/sources.list and put a # before that deb dl.winehq.org/wine-builds/ubuntu bionic main # deb-src dl.winehq.org/wine-builds/ubuntu bionic main line, press ctrl+x and then y and then sudo apt update – Pavel Sayekat Dec 20 '18 at 15:39
  • ok done , now when i type sudo apt update , not have dl.winehq anymore , thanks a lot , have a nice day ^_^ – Sam Lo Dec 20 '18 at 16:36
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    you should also take a look at the similar problem https://askubuntu.com/q/1103240/505225 here :) – Pavel Sayekat Dec 20 '18 at 20:12
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    @SamLo I had the same error recently and the duplicated link here did not help. What I had to do, and now the key is there, is to run the following: sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv F987672F and then it worked for the winehq site. – Terrance Dec 23 '18 at 23:22

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