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Update 240307:Ubuntu 24.04 LTS 进入功能冻结期 预计4月25日正式发布。

Ubuntu 24.04 LTS，代号 「Noble Numbat」，即将与我们见面！
Canonical 已经宣布， Ubuntu 24.04 LTS
作为 LTS 版本，它会有 5 年的常规维护和安全更新。如果订阅 Ubuntu Pro，还能享受额外7年的支持。也就是说， Ubuntu Pro将享有长达 12 年的系统更新保障！！！
接下来，我们将重点介绍 Ubuntu 24.04 LTS 中那些值得关注的新特性，以方便你决定是否进行升级。

Ubuntu 24.04重要升级

一、GNOME 46 默认桌面环境
1.Ubuntu 24.04 LTS 将引入最新的 GNOME 46 作为默认桌面环境。GNOME 设置得到进一步的优化，带来更加整洁的布局和新增的实用功能
二、系列 Snap 软件包
在 Ubuntu 24.04 LTS 中，可以使用简单的命令快速安装一系列基于 Snap 发布的办公软件（基于 Electron 封装的版本），例如 Google 办公套件或 Office 365。
三、Linux Kernel 6.6

Ubuntu 24.04 LTS 搭载了最新的 Linux 6.6 LTS 内核版本，包含了针对笔记本电脑的多种改进，和其他网络相关的优化。

daily版本下载

地址为：https://cdimage.ubuntu.com/daily-live/current/

换源步骤 (阿里源)

以更换阿里源为例，受限打开终端，输入以下命令，备份当前的源列表：

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

打开文本编辑器，输入以下命令：

sudo vim /etc/apt/sources.list

在文本编辑器中粘贴以下内容：

# 阿里云
deb https://mirrors.aliyun.com/ubuntu/ noble main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ noble main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ noble-security main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ noble-security main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ noble-updates main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ noble-updates main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ noble-proposed main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ noble-proposed main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ noble-backports main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ noble-backports main restricted universe multiverse
# 阿里云软件源
deb https://mirrors.aliyun.com/ubuntu/ noble-backports main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ noble-backports main restricted universe multiverse

保存并关闭文本编辑器。

更新源列表，输入以下命令：

sudo apt-get update

如果需要，可以更新系统软件包，输入以下命令：

sudo apt-get upgrade

其他几份国内源如下：

清华源

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-security main restricted universe multiverse# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-proposed main restricted universe multiverse

中科大源

deb https://mirrors.ustc.edu.cn/ubuntu/ noble main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ noble-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ noble-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ noble-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ noble-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble-proposed main restricted universe multiverse

网易163源

deb http://mirrors.163.com/ubuntu/ noble main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ noble-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ noble-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ noble-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ noble-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ noble main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ noble-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ noble-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ noble-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ noble-backports main restricted universe multiverse