在树莓派上安装python-imaging软件时出现了以下错误：

Errors were encountered while processing:
 python-imaging
E: Sub-process /usr/bin/dpkg returned an error code (1)

最后经过比较长时间的摸索，终于解决了这个问题，解决过程如下：

一、故障代码

我将详细的故障代码放在这儿：

pi@raspberrypi:/var/lib/dpkg $ sudo apt-get install python-imaging --reinstall
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 12 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
E: Internal Error, No file name for python-imaging:armhf

pi@raspberrypi:/var/lib/dpkg $ sudo apt-get install python-imaging
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python-imaging is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 12 not upgraded.
1 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
Traceback (most recent call last):
  File "/usr/bin/apt-listchanges", line 28, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'
Setting up python-imaging (2.6.1-2+deb8u3) ...

二、解决办法

cd /var/lib/dpkg 
sudo mv info info.bak #做备份 
sudo mkdir info
sudo apt-get install python-imaging --reinstall #重新安装cmake包
sudo rm -rf info
sudo mv info.bak info #还原info
然后再sudo apt-get install python-imaging就不会出现上面的错误了

三、故障解决

故障终于解决，树莓派系统也可以正常升级了。

pi@raspberrypi:/var/lib/dpkg $ sudo apt-get upgrade 
Reading package lists… Done
Building dependency tree 
Reading state information… Done
Calculating upgrade… Done
The following packages have been kept back:
gstreamer1.0-plugins-bad libgl1-mesa-dri libgstreamer-plugins-bad1.0-0 lxpanel lxpanel-data
plymouth python-gpiozero python-openssl python3-gpiozero raspberrypi-ui-mods sonic-pi
xserver-xorg-input-all
0 upgraded, 0 newly installed, 0 to remove and 12 not upgraded.

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