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意外删除了 /usr/bin/python3

tag-icon • tag-icon apt 20.04 dpkg python3
意外删除了 /usr/bin/python3

我刚刚升级到 Ubuntu 20.04，之前从源代码编译了 python 3.8，当 Ubuntu 的默认版本现在是 python 3.8 时，这变得令人困惑。所以我手动删除了从源二进制文件编译的版本。只是在这个过程中，我不小心删除了系统版本的 python3。

以下是我迄今为止尝试过的：

[~] $ sudo dpkg -i python3_3.8.2-0ubuntu2_amd64.deb 
(Reading database ... 568603 files and directories currently installed.)
Preparing to unpack python3_3.8.2-0ubuntu2_amd64.deb ...
running python pre-rtupdate hooks for python3.8...
Unpacking python3 (3.8.2-0ubuntu2) over (3.8.2-0ubuntu2) ...
dpkg: dependency problems prevent configuration of python3:
 python3 depends on python3.8 (>= 3.8.2-1~); however:
  Package python3.8 is not configured yet.

dpkg: error processing package python3 (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db (2.9.1-1) ...
Errors were encountered while processing:
 python3

这不起作用所以我尝试通过 apt

[~] $ sudo apt install -f python3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3 is already the newest version (3.8.2-0ubuntu2).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up python3.8 (3.8.5-1~20.04) ...
/var/lib/dpkg/info/python3.8.postinst: 9: /usr/bin/python3.8: not found
dpkg: error processing package python3.8 (--configure):
 installed python3.8 package post-installation script subprocess returned error exit status 127
dpkg: dependency problems prevent configuration of python3:
 python3 depends on python3.8 (>= 3.8.2-1~); however:
  Package python3.8 is not configured yet.

dpkg: error processing package python3 (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while proc
essing:
 python3.8
 python3
E: Sub-process /usr/bin/dpkg returned an error code (1)

据我所知，apt 依赖 python3？是真的吗？有什么解决方案可以强制重新安装 python3 吗？

更新：根据评论

sudo dpkg --configure python3.8
Setting up python3.8 (3.8.5-1~20.04) ...
/var/lib/dpkg/info/python3.8.postinst: 9: /usr/bin/python3.8: not found
dpkg: error processing package python3.8 (--configure):
 installed python3.8 package post-installation script subprocess returned error exit status 127
Errors were encountered while processing:
 python3.8

更新 2

/var/lib/dpkg/info/python3.8.postinst通过运行sh /var/lib/dpkg/info/python3.8.postinst（不确定是否有其他方式运行）没有产生任何输出。但是查看文件显示它正在调用被意外删除的 python3.8。

tom@computer[~] $ cat /var/lib/dpkg/info/python3.8.postinst
#! /bin/sh

set -e

case "$1" in
    configure)
    files=$(dpkg -L libpython3.8-stdlib:amd64 | sed -n '/^\/usr\/lib\/python3.8\/.*\.py$/p')
    if [ -n "$files" ]; then
    /usr/bin/python3.8 -E -S /usr/lib/python3.8/py_compile.py $files
    if grep -sq '^byte-compile[^#]*optimize' /etc/python/debian_config; then
        /usr/bin/python3.8 -E -S -O /usr/lib/python3.8/py_compile.py $files
    fi
    else
    echo >&2 "python3.8: can't get files for byte-compilation"
    fi
esac

exit 0 

tom@computer[~] $ /usr/bin/python3.8
-bash: /usr/bin/python3.8: No such file or directory

答案1

您安装的版本比原先的版本旧了一个版本。它python3_3.8.2-0ubuntu2至少需要python3.8 (>= 3.8.2-1~)我的缓存中可用的最旧版本。如果您再次遇到已配置的错误，请使用它。用于dpkg --configure -a配置未配置的软件包。您可以选择从 Ubuntu 的服务器下载我下面显示的最新版本或与您的安装同步的最新 3.8.5。您可以在软件包站点上搜索 Ubuntu，或者如果可能的话使用 apt 来获取所需的文件。

root@zeus-H370M:~# apt-cache policy python3.8
python3.8:
  Installed: 3.8.5-1~20.04
  Candidate: 3.8.5-1~20.04
  Version table:
 *** 3.8.5-1~20.04 500
        500 http://ca.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
 3.8.2-1ubuntu1 500
        500 http://ca.archive.ubuntu.com/ubuntu focal/main amd64 Packages
root@zeus-H370M:~# cat /etc/os-release | grep PRETTY
PRETTY_NAME="Ubuntu 20.04.2 LTS"

https://packages.ubuntu.com/

然后总是有手动解决方案，ar x file.deb如果需要，解压并将文件移动到位，然后编辑状态文件/var/lib/dpkg/status以告知它已安装，然后再试一次。如果在 / 处提取，我认为会将它们放在正确的位置，以确保万无一失，我会创建目录并在其中提取，然后移动到位。

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