我sudo apt-get install python-pip从终端跑了。但我收到以下错误：-
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python-pip
当我sudo apt-get install python-setuptools python-dev build-essential.从终端运行命令时，出现以下错误：-
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python-setuptools
E: Unable to locate package python-dev
E: Unable to locate package build-essential.
E: Couldn't find any package by glob 'build-essential.'
E: Couldn't find any package by regex 'build-essential.'
我该如何解决这个问题？