无法通过apt-get在Ubuntu 12.04.4上找到软件包libffi和libffi5-dev
$ sudo apt-get install libffi libffi5-dev Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package libffi E: Unable to locate package libffi5-dev 另一个尝试： $ sudo apt-get install libffi5 libffi-dev Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to …