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apt-get update 上的公鑰問題
我有 Lubuntu 16.04。我的問題類似於這個問題：
sudo apt-get update Get:1 http://it.archive.ubuntu.com/ubuntu xenial InRelease [247 kB] Hit:2 http://ppa.launchpad.net/fkrull/deadsnakes/ubuntu xenial InRelease Hit:3 http://it.archive.ubuntu.com/ubuntu xenial-updates InRelease Hit:4 http://it.archive.ubuntu.com/ubuntu xenial-backports InRelease Hit:5 http://www.bchemnet.com/suldr debian InRelease Hit:6 http://archive.canonical.com xenial InRelease Get:7 http://security.ubuntu.com/ubuntu xenial-security InRelease [93,3 kB] Fetched 340 kB in 6s (52,6 kB/s) Reading package lists... Done W: There is no public key available for the following key IDs: FB510D557CC3E840提供的答案都不是有效的：
- 根據這個問題的答案#1：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FB510D557CC3E840 Executing: /tmp/tmp.oqit2axEyE/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys FB510D557CC3E840 gpg: requesting key 7CC3E840 from hkp server keyserver.ubuntu.com gpgkeys: key FB510D557CC3E840 not found on keyserver gpg: no valid OpenPGP data found. gpg: Total number processed: 0 gpg: keyserver communications error: key not found gpg: keyserver communications error: bad public key gpg: keyserver receive failed: bad public key
- 或者這個來自同一個問題，回答#2：
sudo apt-get install debian-keyring debian-archive-keyring Reading package lists... Done Building dependency tree Reading state information... Done debian-archive-keyring is already the newest version (2014.3). debian-keyring is already the newest version (2016.01.20). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
- 或者這個來自同一個問題，回答#3：
sudo apt-get install debian-archive-keyring Reading package lists... Done Building dependency tree Reading state information... Done debian-archive-keyring is already the newest version (2014.3). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
- 或者這個來自同一個問題，回答#4：
for n in `ls /var/lib/apt/lists/*gpg`; do echo "$n" ; gpg --list-packets "$n" | grep FB510D557CC3E840; done ls: cannot access '/var/lib/apt/lists/*gpg': No such file or directory
- 或者這個來自同一個問題，回答#5：
sudo apt-get install debian-keyring debian-archive-keyring Reading package lists... Done Building dependency tree Reading state information... Done debian-archive-keyring is already the newest version (2014.3). debian-keyring is already the newest version (2016.01.20). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
- 再試一次，回答這個問題的#1：
gpg --keyserver keyserver.ubuntu.com:80 --recv-keys 7CC3E840 gpg: requesting key 7CC3E840 from keyserver.ubuntu.com:80 gpgkeys: no keyserver host provided gpg: keyserver internal error gpg: keyserver receive failed: keyserver error
- 回答同一問題的第 2 個問題：
sudo gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7CC3E840 gpg: WARNING: unsafe ownership on configuration file `/home/username/.gnupg/gpg.conf' gpg: external program calls are disabled due to unsafe options file permissions gpg: keyserver communications error: general error gpg: keyserver receive failed: general error
- 確保權限沒有問題：
ls -l ~/.gnupg/gpg.conf -rw------- 1 username username 9398 mag 16 15:34 /home/username/.gnupg/gpg.conf
- 從最後一個答案：
apt-key adv --keyserver hkp://keyserver.ubuntu.com --recv-keys 7CC3E840 Executing: /tmp/tmp.8iRzKu4RVN/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com --recv-keys 7CC3E840 gpg: requesting key 7CC3E840 from hkp server keyserver.ubuntu.com gpgkeys: key 7CC3E840 not found on keyserver gpg: no valid OpenPGP data found. gpg: Total number processed: 0 gpg: keyserver communications error: key not found gpg: keyserver communications error: bad public key gpg: keyserver receive failed: bad public key
缺少的密鑰是 Samsung Unified Linux Driver Repository 的密鑰。按照昨天添加到網站的說明應該可以解決問題：
wget http://www.bchemnet.com/suldr/pool/debian/extra/su/suldr-keyring_1_all.deb sudo dpkg -i suldr-keyring_1_all.deb（假設您當然信任儲存庫！）。