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E：py3compile：243：未安装请求的版本

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E：py3compile：243：未安装请求的版本

我正在尝试运行该命令sudo apt-get install build-essential libssl-dev -y。但对于大多数apt-get update命令，我最终都会收到以下错误。不确定这里的 python 包有什么问题

E: py3compile:243: Requested versions are not installed
dpkg: error processing package python3-apt (--configure):
 subprocess installed post-installation script returned error exit status 3
Errors were encountered while processing:
 python3-minimal
 python3-apt
E: Sub-process /usr/bin/dpkg returned an error code (1)

系统信息：

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.2 LTS
Release:        16.04
Codename:       xenial

Python 版本：

$ python --version
Python 2.7.12

$ python3 --version
Python 3.7.4

$ apt-cache policy python3-minimal
python3-minimal:
  Installed: 3.5.1-3
  Candidate: 3.5.1-3
  Version table:
 *** 3.5.1-3 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

& type -a python3
python3 is /home/linuxbrew/.linuxbrew/bin/python3
python3 is /home/linuxbrew/.linuxbrew/bin/python3
python3 is /home/linuxbrew/.linuxbrew/bin/python3
python3 is /home/linuxbrew/.linuxbrew/bin/python3
python3 is /usr/bin/python3

$ file /usr/bin/python3
/usr/bin/python3: symbolic link to /usr/bin/python3.7

$ echo $PATH
/bin:/usr/local/go/bin:/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:/home/rxy/bin:/home/rxy/.local/bin:/bin:/usr/local/go/bin:/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:/home/rxy/bin:/home/rxy/.local/bin:/bin:/usr/local/go/bin:/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:/home/rxy/bin:/home/rxy/.local/bin:/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:/home/rxy/bin:/home/rxy/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/lib/jvm/java-8-oracle/bin:/usr/lib/jvm/java-8-oracle/db/bin:/usr/lib/jvm/java-8-oracle/jre/bin:/usr/local/go/bin:/usr/local/go/bin:/usr/local/go/bin:/usr/local/go/bin

file /usr/bin/python3.5
/usr/bin/python3.5: cannot open `/usr/bin/python3.5' (No such file or directory)

内容~/.profile：

# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.

# the default umask is set in /etc/profile; for setting the umask
# for ssh logins, install and configure the libpam-umask package.
#umask 022

# if running bash
if [ -n "$BASH_VERSION" ]; then
# include .bashrc if it exists
if [ -f "$HOME/.bashrc" ]; then
. "$HOME/.bashrc"
fi
fi

# set PATH so it includes user's private bin directories
PATH="$HOME/bin:$HOME/.local/bin:$PATH"
export PATH='/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin':"$PATH"
export PATH=$PATH:/usr/local/go/bin

答案1

我思考了很长时间，最后想出了这个解决方案（虽然不是很好，但如果可行的话）：

基于这样的想法，Python 本质上是一种解释型语言，py3compile可能很好但不是需要的，所以：

mv /usr/bin/py3compile /usr/bin/py3compile.orig
ln -s $(which true) /usr/bin/py3compile

答案2

py3compile 文件由 python3-minimal 提供，其在 Xenial Xerus 上的默认版本是 3.5.1-3，根据Ubuntu 软件包搜索，这取决于python3.5-minimal，但您安装了 python3.7-minimal，并将默认 python3 设置为 python3.7，这是一个非常糟糕的主意。Python 是 Linux 系统不可或缺的一部分，除非您正在进行实验并且有破坏系统的情绪，否则不应触碰默认 Python。

您需要通过安装python3.5 minimal软件包和更改符号链接来恢复默认的 Python 3（对您而言是 3.5）。为此，请运行：

sudo apt install python3.5-minimal
sudo ln -sf /usr/bin/python3.5 /usr/bin/python3

此外，变量中路径的顺序也定义了优先级。您可以考虑通过修改和更改PATH将自定义路径移到最后~/.profile

export PATH='/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin':"$PATH"

到

export PATH="$PATH":'/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin'

注销并重新登录以使更改生效。运行

sudo dpkg --configure -a

并重试安装问题中提到的软件包。

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