http://security.debian.org/dists/cosmic/Release 404 未找到 [IP：151.101.184.204 80]

Question

kingcanty@kingcanty-HP-Pavilion-17-Notebook-PC:~$ sudo apt-get update
Hit:1 ht tp://mirror.team-cymru. org/ubuntu cosmic InRelease
Ign:2 ht tp://security.debian. org cosmic InRelease                                                                                                                            
Err:3 ht tp://security.debian. org cosmic Release                                                                                                                              
  404  Not Found [IP: 151.101.184.204 80]
Hit:4 ht tp://mirror.team-cymru. org/ubuntu cosmic-updates InRelease                                                                                     
Hit:5 ht tp://mirror.team-cymru. org/ubuntu cosmic-backports InRelease                                                                                   
Hit:6 ht tp://mirror.team-cymru. org/ubuntu cosmic-security InRelease                                                              
Hit:7 ht tp://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu cosmic InRelease                                         
Get:8 ht tp://security.ubuntu.com/ubuntu cosmic-security InRelease [88.7 kB]                           
Reading package lists... Done                                 
E: The repository 'ht tp://security.debian.org cosmic Release' does not have a Release file.
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.
kingcanty@kingcanty-HP-Pavilion-17-Notebook-PC:~$ 

Ubuntu 18.10

# deb cdrom:[Kubuntu 18.10 _Cosmic Cuttlefish_ - Release amd64 (20181017.2)]/ cosmic main multiverse restricted universe
# deb cdrom:[Kubuntu 18.10 _Cosmic Cuttlefish_ - Release amd64 (20181017.2)]/ cosmic main multiverse restricted universe
deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic main restricted universe
deb ht tp://security.ubuntu.com/ubuntu/ cosmic-security main restricted universe
deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic-updates main restricted universe

deb ht tp://security.ubuntu.com/ubuntu cosmic-security main restricted

# See ht tp://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
#deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic restricted
# deb-src ht tp://us.archive.ubuntu.com/ubuntu/ cosmic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
#deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic-updates restricted
# deb-src ht tp://us.archive.ubuntu.com/ubuntu/ cosmic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
# deb-src ht tp://us.archive.ubuntu.com/ubuntu/ cosmic universe
# deb-src ht tp://us.archive.ubuntu.com/ubuntu/ cosmic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic multiverse
# deb-src ht tp://us.archive.ubuntu.com/ubuntu/ cosmic multiverse
deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic-updates multiverse
# deb-src ht tp://us.archive.ubuntu.com/ubuntu/ cosmic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic-backports main restricted universe multiverse
# deb-src ht tp://us.archive.ubuntu.com/ubuntu/ cosmic-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb ht tp://archive.canonical.com/ubuntu cosmic partner
# deb-src ht tp://archive.canonical.com/ubuntu cosmic partner

# deb ht tp://security.ubuntu.com/ubuntu cosmic-security main restricted
# deb-src ht tp://security.ubuntu.com/ubuntu cosmic-security main restricted
# deb ht tp://security.ubuntu.com/ubuntu cosmic-security universe
# deb-src ht tp://security.ubuntu.com/ubuntu cosmic-security universe
deb ht tp://mirror.team-cymru.org/ubuntu/ cosmic-security multiverse
# deb-src ht tp://security.ubuntu.com/ubuntu cosmic-security multiverse

第 7 行是问题所在，它从 'deb ht tp://security.debian.org/ cosmic universe restricted main' 更改为

结果 kingcanty@kingcanty-HP-Pavilion-17-Notebook-PC:~$ sudo apt-get update [sudo] kingcanty 的密码：点击数：1http://mirror.team-cymru.org/ubuntu宇宙发布点击数：2http://mirror.team-cymru.org/ubuntucosmic-updates 发布中
点击数：3http://mirror.team-cymru.org/ubuntucosmic-backports 发布中
点击数：4http://mirror.team-cymru.org/ubuntucosmic-security 发布中
点击数：5http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu宇宙发布中
获取：6http://security.ubuntu.com/ubuntucosmic-security InRelease [88.7 kB]
已读取 88.7 kB，耗时 2 秒 (53.3 kB/s)
正在读取软件包列表... 已完成 kingcanty@kingcanty-HP-Pavilion-17-Notebook-PC:~$

Answer 1

您的 APT sources.list 似乎包含对 security.debian.org 的引用，该引用适用于 Debian，而不是 Ubuntu。虽然他们的存储库与 APT 兼容，但您不会在那里找到适合您操作系统的任何内容。特别是，错误消息表明他们没有名为“cosmic”的版本。

导致问题的代码行似乎是：

http://security.debian.org cosmic Release