python3.10-venv没有安装候选怎么安装python3.10虚拟环境？

Question

我刚刚升级到 Ubuntu 22.04.1 LTS，它预装了 python3.10。 我尝试创建一个虚拟环境，但没有成功。 尝试安装虚拟环境 package 出现错误E: Package 'python3-venv' has no installation candidate

python3 -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']

之后我使用sudo apt install python3.10-venv ，并返回了

sudo 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sudo apt install python3.10-virtualenv会遇到类似的情况

sudo 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/icons-64x64@2.tar) 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/icons-64x64@2.tar) 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

我也已经添加了 deadsnakes ppa 回购协议。 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。

1. python3.8-venv 不适用于 python3.8 -m venv env
2. Pop OS 升级到 21.04 后，python3.8-venv 不再工作
3. Ubuntu 22.04安装Python3.6虚拟环境问题

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。

1. 如何在Ubuntu上使用Python3.10？
2. Ubuntu 22.04安装Python3.6虚拟环境问题
3. pyvenv 不工作，因为 ensurepip 不可用
4. pyvenv 不工作，因为 ensurepip 不可用
5. https://askubuntu.com/questions/879437/ensurepip-is-disabled-in-debian-ubuntu-for-the-system-python
6. Python3.10源码venv变了

Q：python3.10-venv没有安装候选项，如何安装python3.10虚拟环境？

Answer 1

python3.10-venv 典型的是package，提供了Python 3.10中创建虚拟环境的venv模块。 如果在尝试安装时未找到 package，则可能意味着它在 package 存储库中不可用，适用于您的特定发行版或 Linux 版本。

使用 Python 3.10 创建虚拟环境的一种方法是使用 pyenv 工具。 pyenv 允许您在系统上轻松安装和管理 Python 的多个版本。 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安装 Python 3.10：

pyenv install 3.10.0

你可以创造你的环境

pyenv virtualenv 3.10.0 my_env

这将创建一个名为 my_env 的新虚拟环境，它使用 Python 3.10.0。 要激活虚拟环境，请运行以下命令：

pyenv activate my_env