最近我执行了这个命令：
sudo apt-get remove debian-keyring debian-archive-keyring
为防止出现此类错误消息：
WARNING: The following packages cannot be authenticated!
openerp
我的计划是执行这些命令：
sudo apt-get remove debian-keyring debian-archive-keyring
sudo apt-get clean
sudo apt-get update
sudo apt-get -y install debian-keyring debian-archive-keyring
不小心在尝试继续执行代码时收到此错误消息：
[ps193731]$ sudo apt-get clean
sudo: apt-get: command not found
[ps193731]$ sudo apt-get -y install debian-keyring debian-archive-keyring
sudo: apt-get: command not found
作为附加信息，我添加了以下信息：
结果sudo dpkg --configure -a：
[ps193731]$ sudo dpkg --configure -a
dpkg: dependency problems prevent configuration of apt:
apt depends on libstdc++6 (>= 4.6); …