eu estou usando o Ubuntu12.04, incapaz de instalar ferramentas e pacotes mostrando erro [duplicado]

Question

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package ninja is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

deepak@ubuntu:~$ sudo apt-get install cscope
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package cscope is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

esse tipo de erro está aparecendo

    

Answer 1

Isso deve corrigir:

sudo apt-get clean
sudo mv /var/lib/apt/lists /tmp
sudo apt-get clean
sudo apt-get update

Tente novamente.