当我转到sudo apt update计算机上时，最近开始看到此错误：
W: GPG error: http://cdn-fastly.deb.debian.org/debian jessie Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY CBF8D6FD518E17E1
E: The repository 'http://httpredir.debian.org/debian jessie Release' is not signed
而且我不知道为什么。完整的输出是：
Hit:1 http://packages.microsoft.com/repos/vscode stable InRelease
Hit:2 http://apt.pop-os.org/proprietary bionic InRelease
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:4 http://ppa.launchpad.net/snwh/ppa/ubuntu bionic InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Hit:6 https://download.mono-project.com/repo/ubuntu stable-bionic InRelease
Hit:7 https://packages.microsoft.com/ubuntu/18.04/prod bionic InRelease
Hit:8 http://dl.google.com/linux/chrome/deb stable Release
Hit:11 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Ign:9 http://cdn-fastly.deb.debian.org/debian jessie InRelease
Hit:13 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease
Hit:14 http://ppa.launchpad.net/system76/pop/ubuntu bionic InRelease
Get:15 http://cdn-fastly.deb.debian.org/debian jessie Release [148 kB]
Hit:16 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:10 https://packagecloud.io/AtomEditor/atom/any any InRelease
Get:17 http://cdn-fastly.deb.debian.org/debian jessie Release.gpg [2,420 B]
Ign:17 http://cdn-fastly.deb.debian.org/debian jessie Release.gpg
Reading package lists... Done
W: GPG error: http://cdn-fastly.deb.debian.org/debian jessie Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY CBF8D6FD518E17E1
E: The repository 'http://httpredir.debian.org/debian jessie Release' 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.
apt-key list 输出：
/etc/apt/trusted.gpg
--------------------
pub rsa4096 2017-06-22 [SC]
63C4 6DF0 140D 7389 6142 9F4E 204D D8AE C33A 7AFF
uid [ unknown] Pop OS (ISO Signing Key) <[email protected]>
sub rsa4096 2017-06-22 [E]
pub rsa2048 2014-08-04 [SC]
3FA7 E032 8081 BFF6 A14D A29A A6A1 9B38 D3D8 31EF
uid [ unknown] Xamarin Public Jenkins (auto-signing) <[email protected]>
sub rsa2048 2014-08-04 [E]
pub rsa4096 2017-12-15 [SCEA]
0A0F AB86 0D48 5603 32EF B581 B754 42BB DE9E 3B09
uid [ unknown] https://packagecloud.io/AtomEditor/atom (https://packagecloud.io/docs#gpg_signing) <[email protected]>
sub rsa4096 2017-12-15 [SEA]
pub rsa4096 2016-04-12 [SC]
EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796
uid [ unknown] Google Inc. (Linux Packages Signing Authority) <[email protected]>
sub rsa4096 2016-04-12 [S] [expires: 2019-04-12]
sub rsa4096 2017-01-24 [S] [expires: 2020-01-24]
/etc/apt/trusted.gpg.d/libregeek-archive-keyring.gpg
----------------------------------------------------
pub rsa4096 2016-11-23 [SC] [expires: 2018-11-20]
786F ACA9 4AF4 CD9E 43AA 3CC7 05AC DA74 7113 232D
uid [ unknown] Michael DeGuzis <[email protected]>
sub rsa4096 2016-11-23 [E] [expires: 2018-11-20]
pub rsa4096 2015-09-17 [SC] [expires: 2018-11-20]
701B E471 7660 229C BDE0 7304 8106 E728 34C5 89A7
uid [ unknown] SteamOS-Tools Signing Key (SteamOS-Tools repository signing key) <[email protected]>
sub rsa4096 2015-09-17 [E] [expires: 2018-11-20]
pub rsa4096 2016-09-26 [SC] [expired: 2016-12-26]
9391 5C33 6DCE 6B51 5F5D 7197 BD09 77A6 A44A 79DB
uid [ expired] Michael DeGuzis (Primary personal key) <[email protected]>
pub rsa4096 2016-11-04 [SC] [expires: 2018-11-20]
D8E3 C58E 3433 8706 3D0A 5D54 440E B49E 5765 5DD5
uid [ unknown] LibreGeek Signing Key <[email protected]>
sub rsa4096 2016-11-04 [E] [expires: 2018-11-20]
pub rsa2048 2013-12-03 [SC] [expires: 2023-12-01]
726D 300E A8B6 4874 B32F 1370 3F6E D944 7993 A629
uid [ unknown] pandajim (key for lives deb) <[email protected]>
sub rsa2048 2013-12-03 [E] [expires: 2023-12-01]
pub rsa4096 2013-12-10 [SC]
7482 31EB CBD8 08A1 4F5E 85D2 8C00 4C2F 9348 1F6B
uid [ unknown] Brent Timothy Saner <[email protected]>
uid [ unknown] keybase.io/squarer00t <[email protected]>
uid [ unknown] Brent S. (http://www.square-r00t.net) <[email protected]>
uid [ unknown] r00t^2 (https://sysadministrivia.com) <[email protected]>
uid [ unknown] [jpeg image of size 23396]
sub rsa4096 2013-12-10 [E]
pub dsa1024 2004-01-05 [SC]
C520 48C0 C074 8FEE 227D 47A2 7023 53E0 F7E4 8EDB
uid [ unknown] Thomas Dickey <[email protected]>
sub elg1024 2004-01-05 [E]
/etc/apt/trusted.gpg.d/microsoft.asc.gpg
----------------------------------------
pub rsa2048 2015-10-28 [SC]
BC52 8686 B50D 79E3 39D3 721C EB3E 94AD BE12 29CF
uid [ unknown] Microsoft (Release signing) <[email protected]>
/etc/apt/trusted.gpg.d/microsoft.gpg
------------------------------------
pub rsa2048 2015-10-28 [SC]
BC52 8686 B50D 79E3 39D3 721C EB3E 94AD BE12 29CF
uid [ unknown] Microsoft (Release signing) <[email protected]>
/etc/apt/trusted.gpg.d/snwh_ubuntu_ppa.gpg
------------------------------------------
pub rsa1024 2012-06-27 [SC]
D320 D0C3 0B02 E64C 5B2B B274 3766 2239 8999 3A70
uid [ unknown] Launchpad PPA for Sam Hewitt
/etc/apt/trusted.gpg.d/system76_ubuntu_pop.gpg
----------------------------------------------
pub rsa4096 2017-06-19 [SC]
E6AC 1657 2ED1 AD6F 96C7 EBE0 1E5F 8BBC 5BEB 10AE
uid [ unknown] Launchpad PPA for System76
/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-archive.gpg
------------------------------------------------------
pub rsa4096 2012-05-11 [SC]
790B C727 7767 219C 42C8 6F93 3B4F E6AC C0B2 1F32
uid [ unknown] Ubuntu Archive Automatic Signing Key (2012) <[email protected]>
/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
------------------------------------------------------
pub rsa4096 2012-05-11 [SC]
8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092
uid [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>
apt policy debian-archive-keyring 输出：
debian-archive-keyring:
Installed: 2017.7ubuntu1
Candidate: 2017.7ubuntu1
Version table:
*** 2017.7ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
500 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages
100 /var/lib/dpkg/status
dpkg -L debian-archive-keyring 输出：
/.
/usr
/usr/share
/usr/share/doc
/usr/share/doc/debian-archive-keyring
/usr/share/doc/debian-archive-keyring/README
/usr/share/doc/debian-archive-keyring/changelog.gz
/usr/share/doc/debian-archive-keyring/copyright
/usr/share/keyrings
/usr/share/keyrings/debian-archive-jessie-automatic.gpg
/usr/share/keyrings/debian-archive-jessie-security-automatic.gpg
/usr/share/keyrings/debian-archive-jessie-stable.gpg
/usr/share/keyrings/debian-archive-keyring.gpg
/usr/share/keyrings/debian-archive-removed-keys.gpg
/usr/share/keyrings/debian-archive-stretch-automatic.gpg
/usr/share/keyrings/debian-archive-stretch-security-automatic.gpg
/usr/share/keyrings/debian-archive-stretch-stable.gpg
/usr/share/keyrings/debian-archive-wheezy-automatic.gpg
/usr/share/keyrings/debian-archive-wheezy-stable.gpg
正在运行Pop！_OS 18.04 LTS x86_64
内核4.15.0-23通用
您的apt-key设置没有任何Debian存档密钥，这就是为什么apt无法验证Debian存储库的原因。安装debian-archive-keyring以修复该问题：
sudo apt install debian-archive-keyring
由于您使用的是Ubuntu版本的软件包，因此需要链接密钥环：
sudo ln -s /usr/share/keyrings/debian-archive*.gpg /etc/apt/trusted.gpg.d/
完成后，更新存储库索引：
sudo apt update
安装程序可能会抱怨无法验证软件包（并且您仍然应该告诉它继续进行），但是在更新后应解决此问题。
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我来说两句