树莓派python-rpi.gpio依赖故障导致apt/dpkg操作失败求助

我完全理解你的困境——树莓派上有重要工作任务，不想重装系统丢失数据，却被这个顽固的python-rpi.gpio错误卡住，每次APT操作都失败。咱们一步步来解决这个问题：

先梳理你的问题现状 #

• 每次执行安装、升级或autoremove操作都会触发错误
• 未安装Python2.7，仅安装了Python3，无法安装Python2或其他软件包
• 尝试删除python-rpi.gpio_0.7.0-0.1~bpo10+4_armhf.deb但文件反复出现
• 已试过sudo apt-get install -f和sudo apt update --fix-missing，无效
• 执行sudo dpkg --remove --force-remove --reinstreq时提示dpkg: error: unknown force/refuse option 'remove'

你执行sudo apt autoremove的错误输出如下：

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
python-rpi.gpio
The following packages will be upgraded:
python-rpi.gpio
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
18 not fully installed or removed.
Need to get 0 B/20.7 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Reading changelogs... Done
(Reading database ... 152893 files and directories currently installed.)
Preparing to unpack .../python-rpi.gpio_0.7.0-0.1~bpo10+4_armhf.deb ...
/var/lib/dpkg/info/python-rpi.gpio.prerm: 6: /var/lib/dpkg/info/python-rpi.gpio.prerm: pyclean: Too many levels of symbolic links
dpkg: warning: old python-rpi.gpio package pre-removal script subprocess returned error exit status 2
dpkg: trying script from the new package instead ...
/var/lib/dpkg/tmp.ci/prerm: 6: /var/lib/dpkg/tmp.ci/prerm: pyclean: Too many levels of symbolic links
dpkg: error processing archive /var/cache/apt/archives/python-rpi.gpio_0.7.0-0.1~bpo10+4_armhf.deb (--unpack):
new python-rpi.gpio package pre-removal script subprocess returned error exit status 2
/var/lib/dpkg/info/python-rpi.gpio.postinst: 6: /var/lib/dpkg/info/python-rpi.gpio.postinst: pycompile: Too many levels of symbolic links
dpkg: error while cleaning up:
installed python-rpi.gpio package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
/var/cache/apt/archives/python-rpi.gpio_0.7.0-0.1~bpo10+4_armhf.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

第一步：修复Python符号链接循环问题 #

错误提示里的Too many levels of symbolic links是核心原因，说明系统中python的符号链接出现了循环（比如python链接到python3，而python3又链接回python）。

1. 先检查当前的Python符号链接：

   ls -l /usr/bin/python
   ls -l /usr/bin/python3
   

   如果发现python和python3互相指向对方，就确认存在循环链接。

2. 修复循环链接：

   sudo rm /usr/bin/python
   sudo ln -s /usr/bin/python3 /usr/bin/python
   

   这样就建立了python指向python3的正确单向链接。

第二步：强制清理异常的python-rpi.gpio包 #

你之前用错了dpkg命令，正确的强制操作步骤如下：

1. 强制移除状态异常的python-rpi.gpio包：

   sudo dpkg --remove --force-all python-rpi.gpio
   

2. 彻底清理缓存中反复生成的deb文件：

   sudo rm /var/cache/apt/archives/python-rpi.gpio_0.7.0-0.1~bpo10+4_armhf.deb
   

3. 修复APT依赖关系：

   sudo apt-get install -f
   

第三步：如果上述步骤无效，手动修改包脚本 #

如果还是因为prerm/postinst脚本调用pyclean/pycompile报错，我们可以临时修改这些脚本，跳过有问题的步骤：

1. 编辑旧包的预移除脚本：

   sudo nano /var/lib/dpkg/info/python-rpi.gpio.prerm
   

   找到第6行的pyclean命令，在行首添加#注释掉这一行，保存退出（按Ctrl+O→回车→Ctrl+X）。

2. 同样处理旧包的 post-install 脚本：

   sudo nano /var/lib/dpkg/info/python-rpi.gpio.postinst
   

   找到第6行的pycompile命令，也注释掉它。

3. 再次尝试移除包并修复依赖：

   sudo dpkg --purge python-rpi.gpio
   sudo apt-get install -f
   

完成这些步骤后，应该就能正常使用APT命令了。如果之后需要使用GPIO功能，建议安装Python3版本的包：sudo apt install python3-rpi.gpio，避免再触发Python2相关的脚本问题。

内容的提问来源于stack exchange，提问作者André Clérigo