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Debian Linux Python PIP 在安裝某些套件的時候(pip install package)，遇到這個錯誤訊息：
defaulting to user installation because normal site-packages is not writeable normal site-packages is not writeable
於是直接把這個資料夾搬走看看(chmod 777 這些當然都測試過了)
mv ~/.local/lib/python3.9/site-packages ~/.local/lib/python3.9/site-packages2
然後在重新安裝之類的，都遇到一樣無法寫入的問題~
閱讀全文〈Debian Linux 11 PIP 安裝遇到 site-packages is not writeable 解法〉
Debian Linux 遇到 NO_PUBKEY GPG error 的解法可見此篇：Linux APT 遇到 NO_PUBKEY 的 GPG error 解法
若已經新增卻還是遇到簽名無效的錯誤，可以怎麼做呢？
Debian / Ubuntu Linux 若使用外部套件(Apt sources.list 有額外增加)，apt update 常常會遇到下述訊息：
由於無法取得它們的公鑰，以下簽章無法進行驗證： NO_PUBKEY 9334A25F8507EFA5
或
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9334A25F8507EFA5
W: GPG error: http://repo.percona.com/apt stretch InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9334A25F8507EFA5
要怎麼解決呢？
Linux CLI 使用 Mutt 寄信、收信蠻方便的，Debian 升級到 Stretch 後，寄信就會出現下述訊息：
GPGME: CMS protocol not available
註：於 CLI 界面使用 Cron 寄信，命令參數：mutt -s "This is Title" root < $content_file
Debian / Ubuntu Linux 遇到大量的 GPG error (BADSIG) 要怎麼解決呢？
錯誤訊息如下述：
問題1
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com stable Release: 以下簽名無效： BADSIG A040830F7FAC5991 Google, Inc. Linux Package Signing Key \<[email protected]\>
W: 無法取得 http://dl.google.com/linux/mod-pagespeed/deb/dists/stable/Release，
W: Some index files failed to download. They have been ignored, or old ones used instead.
問題2
W: GPG error: http://dl.google.com stable Release: The following signatures were invalid: BADSIG A040830F7FAC5991 Google, Inc. Linux Package Signing Key \<[email protected]\>
W: GPG error: http://security.ubuntu.com precise-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key \<[email protected]\>
W: GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key \<[email protected]\>
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG 531EE72F4C9D234C Launchpad webupd8
W: GPG error: http://in.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key \<[email protected]\>
W: GPG error: http://in.archive.ubuntu.com precise-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key \<[email protected]\>