質問編集履歴
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追加2を書き込みました.
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### 補足情報（FW/ツールのバージョンなど）
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Ubuntu 20.04
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-
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wsl2
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### 追加事項
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**1**
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[参考ブログ](https://pyopyopyo.hatenablog.com/entry/20180514/p1)
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この記事の1を試した段階で以下のメッセージが出ました.
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**gpg: keyserver receive failed: No data **
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**gpg: keyserver receive failed: No data **
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**2**
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[ask Ubuntu](https://askubuntu.com/questions/1298042/unable-to-use-sudo-apt-get-update-no-pubkey-26eb39123aaaaa96)
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上記の記事を参考に, **sudo apt-key update**と 打ち込んだら,
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**:~$ sudo apt-key update**
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Warning: 'apt-key update' is deprecated and should not be used anymore!
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gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
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gpg: key 3B4FE6ACC0B21F32: "Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>" not changed
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gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
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gpg: key D94AA3F0EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>" not changed
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gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
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gpg: key 871920D1991BC93C: "Ubuntu Archive Automatic Signing Key (2018) <ftpmaster@ubuntu.com>" not changed
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gpg: Total number processed: 3
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gpg: unchanged: 3
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**この後に sudo apt updateを打ち込んだら**
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**:~$ sudo apt update**
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Get:1 https://cli-assets.heroku.com/apt ./ InRelease [2879 B]
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Hit:2 https://download.docker.com/linux/ubuntu focal InRelease
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Err:1 https://cli-assets.heroku.com/apt ./ InRelease
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The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6DB5542C356545CF
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Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease Hit:5 http://archive.ubuntu.com/ubuntu focal-updates InRelease
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Hit:6 http://archive.ubuntu.com/ubuntu focal-backports InRelease
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Hit:7 https://dl.yarnpkg.com/debian stable InRelease Ign:4 https://dl.bintray.com/etcher/debian stable InRelease Hit:9 http://security.ubuntu.com/ubuntu focal-security InRelease
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Get:8 https://dl.bintray.com/etcher/debian stable Release [3674 B] Get:10 https://dl.bintray.com/etcher/debian stable Release.gpg [821 B] Ign:10 https://dl.bintray.com/etcher/debian stable Release.gpg Reading package lists... Done
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W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://cli-assets.heroku.com/apt ./ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6DB5542C356545CF
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W: GPG error: https://dl.bintray.com/etcher/debian stable Release:
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The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 379CE192D401AB61
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E: The repository 'https://deb.etcher.io stable Release' is not signed.
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N: Updating from such a repository can't be done securely, and is therefore disabled by default.
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N: See apt-secure(8) manpage for repository creation and user configuration details.
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1
エラー文に少しと追加情報を書きました.
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いつものようにsudo apt update をしようとしてもエラーが出てできなくなってしまいました.
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### 発生している問題・エラーメッセージ
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Err:1 https://cli-assets.heroku.com/apt ./ InRelease
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The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6DB5542C356545CF
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W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://cli-assets.heroku.com/apt ./ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6DB5542C356545CF
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W: Failed to fetch https://cli-assets.heroku.com/apt/./InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6DB5542C356545CF
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W: Some index files failed to download. They have been ignored, or old ones used instead.
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### 試したこと
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以下のことを試しましたが, 続いてこのようなエラーが出ました
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__以下のことを試しましたが, 続いてこのようなエラーが出ました__
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**gpg: keyserver receive failed: Server indicated a failure**
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[apt-get update時に「公開鍵を利用できないため、以下の署名は検証できませんでした」と出た場合](https://qiita.com/ReoNagai/items/777885f8e704028f3ab9)
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18
25
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### 補足情報（FW/ツールのバージョンなど）
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19
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-
Ubuntu 20.04
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26
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+
Ubuntu 20.04
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27
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+
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28
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+
### 追加事項
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|
29
|
+
[参考ブログ](https://pyopyopyo.hatenablog.com/entry/20180514/p1)
|
|
30
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+
この記事の1を試した段階で以下のメッセージが出ました.
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31
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+
**gpg: keyserver receive failed: No data **
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