我对我的 Ubuntu 安装没有任何抱怨，它运行良好。
最近我发现有 7 个 Python 更新无法安装 - 每个更新都以 Ubuntu 版本 20.04.4 为前缀。我检查了我的 Ubuntu 安装版本，它是 20.04.2。
Ubuntu 20.04.4 似乎于 2022 年 3 月推出，但我的更新程序由于某种原因没有包括它。
~$ lsb_release -a
LSB Version: core-11.1.0ubuntu2-noarch:printing-11.1.0ubuntu2-noarch:security-11.1.0ubuntu2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
~$ sudo apt update
[sudo] password for sandbar:
Hit:1 http://repo.mysql.com/apt/ubuntu focal InRelease
Hit:2 http://packages.microsoft.com/repos/edge stable InRelease
Hit:3 http://ppa.launchpad.net/blaze/rtbth-dkms/ubuntu focal InRelease
Hit:4 http://archive.canonical.com/ubuntu focal InRelease
Hit:5 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:6 http://ie.archive.ubuntu.com/ubuntu focal InRelease
Hit:7 http://packages.microsoft.com/repos/code stable InRelease
Hit:8 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:9 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease
Hit:10 http://ppa.launchpad.net/gezakovacs/ppa/ubuntu focal InRelease
Hit:11 http://ppa.launchpad.net/kisak/kisak-mesa/ubuntu focal InRelease
Hit:12 http://ppa.launchpad.net/linuxuprising/java/ubuntu focal InRelease
Hit:13 https://download.sublimetext.com apt/stable/ InRelease
Hit:14 http://ppa.launchpad.net/lyzardking/ubuntu-make/ubuntu focal InRelease
Hit:15 http://ppa.launchpad.net/mkusb/ppa/ubuntu focal InRelease
Hit:16 http://ppa.launchpad.net/slyon/iwd+nm/ubuntu focal InRelease
Hit:17 http://ppa.launchpad.net/swi-prolog/stable/ubuntu focal InRelease
Hit:18 http://ppa.launchpad.net/ubuntu-mozilla-daily/firefox-aurora/ubuntu focal InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up-to-date.
~$
为何我的机器没有进入更新循环？
机器：戴尔 Inspiron 15 5000 系列
中央处理器：i5-7xxx
内存：16 GB
图形处理器：AMD Radeon R7 M445
20.04.4 安装后的 APT 源列表
# deb cdrom:[Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731)]/ focal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ie.archive.ubuntu.com/ubuntu/ focal main restricted
# deb-src http://ie.archive.ubuntu.com/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
# deb-src http://ie.archive.ubuntu.com/ubuntu/ focal-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 http://ie.archive.ubuntu.com/ubuntu/ focal universe
# deb-src http://ie.archive.ubuntu.com/ubuntu/ focal-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 http://ie.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://ie.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://ie.archive.ubuntu.com/ubuntu/ focal-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-src http://ie.archive.ubuntu.com/ubuntu/ focal-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 http://archive.canonical.com/ubuntu focal partner
# deb-src http://archive.canonical.com/ubuntu focal partner
deb http://security.ubuntu.com/ubuntu focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu focal-security universe
deb http://security.ubuntu.com/ubuntu focal-security multiverse
# deb-src http://security.ubuntu.com/ubuntu focal-security multiverse
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
deb http://archive.ubuntu.com/ubuntu/ focal-updates focal-updates restricted deb-src multiverse main universe http://archive.ubuntu.com/ubuntu/
# deb-src http://archive.ubuntu.com/ubuntu/ focal-updates focal-updates restricted deb-src multiverse main universe http://archive.ubuntu.com/ubuntu/
答案1
您缺少focal-updatesUbuntu 存储库。这就是您的系统运行 20.04.2 的原因。
文件中的几个错误/etc/apt/sources.list表明有人在手动编辑文件时犯了错误。
- 在该文件中添加以下行：
deb http://ie.archive.ubuntu.com/ubuntu/ focal-updates main restricted multiverse
- 从该文件中删除格式错误的行：
deb http://archive.ubuntu.com/ubuntu/ focal-updates focal-updates restricted deb-src multiverse main universe http://archive.ubuntu.com/ubuntu/
- 跑步
sudo apt update。
这将解决您提出的问题：您的系统将能够检测到 20.04.4 及更高版本的更新。它不会解决您通过添加无效/过时的 PPA 而造成的其他问题，这些问题可能仍会阻止安装这些更新。