前陣子安裝K6進行壓力測試後，測試主機就無法自動透過Ubuntu 的 apt 工具來進行更新系統上的套件。
錯誤訊息
apt 更新時會出現以下錯誤訊息，主要問題點在於系統無法驗證Public key 。
W: GPG error: https://dl.k6.io/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C780D0BDB1A69C86
E: The repository 'https://dl.k6.io/deb stable 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.
解決步驟
先刪除原本的K6驗證Key
$ sudo apt-key del k6
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
OK重新匯入新的驗證key
$ sudo gpg --no-default-keyring --keyring /usr/share/keyrings/k6-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys C5AD17C747E3415A3642D57D77C6C491D6AC1D69
gpg: WARNING: unsafe permissions on homedir '/root/.gnupg'
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key 77C6C491D6AC1D69: public key "k6.io (key for signing binaries) <security@k6.io>" imported
gpg: Total number processed: 1
gpg: imported: 1顯示錯誤
如果匯入key時顯示沒有 /root/.gnupg/ 這個路徑，可以透過以下方式解決。
gpg: failed to create temporary file '/root/.gnupg/.#lk0x0000558ad9bd40c0.cjk.33516': No such file or directory
gpg: connecting dirmngr at '/root/.gnupg/S.dirmngr' failed: No such file or directory
gpg: keyserver receive failed: No dirmngr新增路徑來讓指令可以正常執行
$ sudo mkdir /root/.gnupg/重新將key 與apt 軟體驗證設定在一起
cjk@cjk:~$ echo "deb [signed-by=/usr/share/keyrings/k6-archive-keyring.gpg] https://dl.k6.io/deb stable main" | sudo tee /etc/apt/sources.list.d/k6.list
deb [signed-by=/usr/share/keyrings/k6-archive-keyring.gpg] https://dl.k6.io/deb stable main
以上都處理完畢後就可以正常apt更新了
