localhost:/# apt-get install php5
Reading package lists... Done
Building dependency tree... Done
The following extra packages will be installed:
  apache2-mpm-prefork libapache2-mod-php5 php5-common
Suggested packages:
  php-pear
The following packages will be REMOVED:
  apache2-mpm-worker
The following NEW packages will be installed:
  apache2-mpm-prefork libapache2-mod-php5 php5 php5-common
0 upgraded, 4 newly installed, 1 to remove and 0 not upgraded.
Need to get 0B/3043kB of archives.
After unpacking 5890kB of additional disk space will be used.
Do you want to continue [Y/n]? y
FATAL -> Failed to fork.
localhost:/#