linux执行升级/etc/environment错误

错误如下:
Setting up install-info (6.1.0.dfsg.1-5) ...
/usr/sbin/update-info-dir: 2: /etc/environment: source: not found
dpkg: error processing package install-info (--configure):
subprocess installed post-installation script returned error exit 
status 127
Errors were encountered while processing:
 install-info
E: Sub-process /usr/bin/dpkg returned an error code (1)

解决办法:

cd /var/lib/dpkg/info
sudo rm *.postinst
sudo apt-get update