$ 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
еще одна попытка:
$ sudo apt-get install libffi5 libffi-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libffi5
а также
$ cat /etc/issue
Ubuntu 12.04.4 LTS \n \l
Что мне теперь делать?