我刚刚升级到 Ubuntu 22.04.1 LTS，它预装了 python3.10。我尝试创建虚拟环境但不成功。尝试安装虚拟环境包出现错误
E: Package 'python3-venv' has no installation candidatepython3 -m venv newpy310
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.
apt install python3.10-venv
You may need to use sudo with that command. After installing the python3-venv
package, recreate your virtual environment.
Failing command: ['/home/user/Desktop/pyenvs/newpy310/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']
接下来我使用了
sudo apt install python3.10-venvsudo apt install python3.10-venv
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python3.10-venv is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'python3.10-venv' has no installation candidate
如果我使用的话也会遇到类似的情况
sudo apt install python3.10-virtualenvsudo apt-get install python3.10-virtualenv
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package python3.10-virtualenv
E: Couldn't find any package by glob 'python3.10-virtualenv'
E: Couldn't find any package by regex 'python3.10-virtualenv'
我的 sudo apt-get update 看起来也很可疑，但我不完全确定它是否是罪魁祸首
sudo apt update
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://security.ubuntu.com/ubuntu jammy-security InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:5 https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu jammy InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:7 http://archive.ubuntu.com/ubuntu jammy InRelease
Hit:8 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
8 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en_SG) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11-icons-hidpi (main/dep11/[email protected]) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en_SG) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target DEP-11-icons-hidpi (main/dep11/[email protected]) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:14
我还已经添加了 deadsnakes ppa 存储库。我注意到其他一些问题是针对 python 3.6 或 3.8 的，这些问题在我过去分别使用 python 3.6 和 3.8 时有效。但是，其中描述的方法不适用于我当前使用 Ubuntu 22.04 和 python3.10 的设置。
这些是我咨询过但对我不起作用的其他链接。我也尝试过重新安装 python3.10 本身。
问：当python3.10-venv没有安装候选时，如何安装python3.10虚拟环境？
python3.10-venv 通常是提供 venv 模块的包，用于在 Python 3.10 中创建虚拟环境。如果您在尝试安装时找不到该软件包，则可能意味着该软件包在您的特定发行版或 Linux 版本的软件包存储库中不可用。
使用 Python 3.10 创建虚拟环境的一种方法是使用 pyenv 工具。 pyenv 允许您轻松地在系统上安装和管理多个版本的 Python。您可以按照 GitHub 页面上的说明安装 pyenv：https://github.com/pyenv/pyenv
安装 pyenv 后，您可以通过运行以下命令来安装 Python 3.10：
pyenv install 3.10.0
您可以创建您的环境
pyenv virtualenv 3.10.0 my_env
这将创建一个名为 my_env 的新虚拟环境，该环境使用 Python 3.10.0。要激活虚拟环境，请运行以下命令：
pyenv activate my_env
我在
python3.10-venv上安装
Ubuntu22.04.1 LTS 时遇到了同样的问题
但是，只需升级 apt 即可解决该问题。
sudo apt update
sudo apt upgrade
事后
sudo apt install python3.10-venv编辑：（关于更新问题）
抱歉，我确实注意到您的问题
apt update/etc/apt/sources.list但是，这不应该成为问题。 所以，如果您还没有尝试过，请尝试
sudo apt upgrade从另一个问题的评论中发现问题是因为我写问题时尚未添加 venv 包
运行sudo apt install python3.10-venv
现在允许我安装该软件包，并且我现在可以在默认的 Ubuntu 22.04 LTS 上创建一个 python3.10 虚拟环境