我有一个运行8.8的debian服务器 当我做一个简单的sudo apt-get更新时，我得到以下内容：
Ign http://mirrors.online.net jessie InRelease
Hit http://mirrors.online.net jessie Release.gpg
Hit http://mirrors.online.net jessie Release
Hit http://security.debian.org jessie/updates InRelease
Ign http://ppa.launchpad.net jessie InRelease
Ign http://ppa.launchpad.net jessie Release.gpg
Ign http://ppa.launchpad.net jessie Release
Get:1 http://mirrors.online.net jessie/main Sources [7,055 kB]
Hit http://security.debian.org jessie/updates/non-free Sources
Hit http://security.debian.org jessie/updates/non-free amd64 Packages
Err http://ppa.launchpad.net jessie/main amd64 Packages
404 Not Found
Hit http://security.debian.org jessie/updates/non-free Translation-en
Ign http://ppa.launchpad.net jessie/main Translation-en_US
Hit http://security.debian.org jessie/updates/main Sources
Ign http://ppa.launchpad.net jessie/main Translation-en
Hit http://security.debian.org jessie/updates/contrib Sources
Hit http://security.debian.org jessie/updates/main amd64 Packages
Hit http://security.debian.org jessie/updates/contrib amd64 Packages
Hit http://security.debian.org jessie/updates/contrib Translation-en
Hit http://security.debian.org jessie/updates/main Translation-en
Get:2 http://mirrors.online.net jessie/non-free Sources [99.5 kB]
Get:3 http://mirrors.online.net jessie/contrib Sources [50.8 kB]
Get:4 http://mirrors.online.net jessie/main amd64 Packages [6,790 kB]
Get:5 http://mirrors.online.net jessie/non-free amd64 Packages [83.6 kB]
Get:6 http://mirrors.online.net jessie/contrib amd64 Packages [50.2 kB]
Get:7 http://mirrors.online.net jessie/contrib Translation-en [38.5 kB]
Get:8 http://mirrors.online.net jessie/main Translation-en [4,583 kB]
Get:9 http://mirrors.online.net jessie/non-free Translation-en [72.1 kB]
Get:10 http://oss.oracle.com unstable InRelease [148 B]
Ign http://oss.oracle.com unstable InRelease
Get:11 http://oss.oracle.com unstable Release.gpg [189 B]
Hit http://oss.oracle.com unstable Release
Ign http://oss.oracle.com unstable Release
Get:12 http://oss.oracle.com unstable/main amd64 Packages [148 B]
Err http://oss.oracle.com unstable/main amd64 Packages
Get:13 http://oss.oracle.com unstable/non-free amd64 Packages [148 B]
Err http://oss.oracle.com unstable/non-free amd64 Packages
Get:14 http://oss.oracle.com unstable/main Translation-en_US [148 B]
Get:15 http://oss.oracle.com unstable/main Translation-en [148 B]
Get:16 http://oss.oracle.com unstable/non-free Translation-en_US [148 B]
Get:17 http://oss.oracle.com unstable/non-free Translation-en [148 B]
Get:18 http://oss.oracle.com unstable/main amd64 Packages [148 B]
Err http://oss.oracle.com unstable/main amd64 Packages
Get:19 http://oss.oracle.com unstable/non-free amd64 Packages [148 B]
Err http://oss.oracle.com unstable/non-free amd64 Packages
Get:20 http://oss.oracle.com unstable/main Translation-en_US [148 B]
Get:21 http://oss.oracle.com unstable/main Translation-en [148 B]
Get:22 http://oss.oracle.com unstable/non-free Translation-en_US [148 B]
Get:23 http://oss.oracle.com unstable/non-free Translation-en [148 B]
Get:24 http://oss.oracle.com unstable/main amd64 Packages [148 B]
Err http://oss.oracle.com unstable/main amd64 Packages
Get:25 http://oss.oracle.com unstable/non-free amd64 Packages [148 B]
Err http://oss.oracle.com unstable/non-free amd64 Packages
Get:26 http://oss.oracle.com unstable/main Translation-en_US [148 B]
Get:27 http://oss.oracle.com unstable/main Translation-en [148 B]
Get:28 http://oss.oracle.com unstable/non-free Translation-en_US [148 B]
Get:29 http://oss.oracle.com unstable/non-free Translation-en [148 B]
Get:30 http://oss.oracle.com unstable/main amd64 Packages [148 B]
Get:31 http://oss.oracle.com unstable/non-free amd64 Packages [148 B]
Err http://oss.oracle.com unstable/non-free amd64 Packages
Get:32 http://oss.oracle.com unstable/main Translation-en_US [148 B]
Get:33 http://oss.oracle.com unstable/main Translation-en [148 B]
Get:34 http://oss.oracle.com unstable/non-free Translation-en_US [148 B]
Get:35 http://oss.oracle.com unstable/non-free Translation-en [148 B]
Get:36 http://oss.oracle.com unstable/main amd64 Packages [148 B]
Err http://oss.oracle.com unstable/main amd64 Packages
HttpError404
Get:37 http://oss.oracle.com unstable/non-free amd64 Packages [148 B]
Err http://oss.oracle.com unstable/non-free amd64 Packages
HttpError404
Get:38 http://oss.oracle.com unstable/main Translation-en_US [148 B]
Ign http://oss.oracle.com unstable/main Translation-en_US
Get:39 http://oss.oracle.com unstable/main Translation-en [148 B]
Ign http://oss.oracle.com unstable/main Translation-en
Get:40 http://oss.oracle.com unstable/non-free Translation-en_US [148 B]
Ign http://oss.oracle.com unstable/non-free Translation-en_US
Get:41 http://oss.oracle.com unstable/non-free Translation-en [148 B]
Ign http://oss.oracle.com unstable/non-free Translation-en
Fetched 18.8 MB in 24s (761 kB/s)
W: GPG error: http://oss.oracle.com unstable Release: The following signatures were invalid: KEYEXPIRED 1378511808 KEYEXPIRED 1378511808 KEYEXPIRED 1378511808
W: Failed to fetch http://ppa.launchpad.net/bitcoin/bitcoin/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://oss.oracle.com/debian/dists/unstable/main/binary-amd64/Packages HttpError404
W: Failed to fetch http://oss.oracle.com/debian/dists/unstable/non-free/binary-amd64/Packages HttpError404
E: Some index files failed to download. They have been ignored, or old ones used instead.
这是sudo apt-key list的输出：
/etc/apt/trusted.gpg
--------------------
pub 1024D/B38A8516 2006-09-05 [expired: 2013-09-06]
uid Oracle OSS group (Open Source Software group) <build@oss.oracle.com>
/etc/apt/trusted.gpg.d/bitcoin-bitcoin.gpg
------------------------------------------
pub 1024R/8842CE5E 2011-10-26
uid Launchpad PPA for Bitcoin
/etc/apt/trusted.gpg.d/debian-archive-jessie-automatic.gpg
----------------------------------------------------------
pub 4096R/2B90D010 2014-11-21 [expires: 2022-11-19]
uid Debian Archive Automatic Signing Key (8/jessie) <ftpmaster@debian.org>
/etc/apt/trusted.gpg.d/debian-archive-jessie-security-automatic.gpg
-------------------------------------------------------------------
pub 4096R/C857C906 2014-11-21 [expires: 2022-11-19]
uid Debian Security Archive Automatic Signing Key (8/jessie) <ftpmaster@debian.org>
/etc/apt/trusted.gpg.d/debian-archive-jessie-stable.gpg
-------------------------------------------------------
pub 4096R/518E17E1 2013-08-17 [expires: 2021-08-15]
uid Jessie Stable Release Key <debian-release@lists.debian.org>
/etc/apt/trusted.gpg.d/debian-archive-squeeze-automatic.gpg
-----------------------------------------------------------
pub 4096R/473041FA 2010-08-27 [expires: 2018-03-05]
uid Debian Archive Automatic Signing Key (6.0/squeeze) <ftpmaster@debian.org>
/etc/apt/trusted.gpg.d/debian-archive-squeeze-stable.gpg
--------------------------------------------------------
pub 4096R/B98321F9 2010-08-07 [expires: 2017-08-05]
uid Squeeze Stable Release Key <debian-release@lists.debian.org>
/etc/apt/trusted.gpg.d/debian-archive-wheezy-automatic.gpg
----------------------------------------------------------
pub 4096R/46925553 2012-04-27 [expires: 2020-04-25]
uid Debian Archive Automatic Signing Key (7.0/wheezy) <ftpmaster@debian.org>
/etc/apt/trusted.gpg.d/debian-archive-wheezy-stable.gpg
-------------------------------------------------------
pub 4096R/65FFB764 2012-05-08 [expires: 2019-05-07]
uid Wheezy Stable Release Key <debian-release@lists.debian.org>
我们可以清楚地看到键B38A8516已过期。 我没有成功地试过这个命令：
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys B38A8516
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.66fa6TtioE --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/bitcoin-bitcoin.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-security-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-stable.gpg --keyserver pgp.mit.edu --recv-keys B38A8516
gpg: requesting key B38A8516 from hkp server pgp.mit.edu
gpg: key B38A8516: "Oracle OSS group (Open Source Software group) <build@oss.oracle.com>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
我甚至尝试使用apt-key del B38A8516手动删除密钥并重新安装。我总是以相同的过期密钥结束...
有人对此有暗示吗？我完全失去了......
干杯， ASTRUS