bushmaster@bushmaster-Inspiron-1545:~$ sudo apt-get install ffmpeg libavcodec-extra-53 libav-tools
[sudo] password for bushmaster: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package ffmpeg 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

Package libavcodec-extra-53 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
However the following packages replace it:
  libav-tools

E: Package 'ffmpeg' has no installation candidate
E: Package 'libavcodec-extra-53' has no installation candidate
bushmaster@bushmaster-Inspiron-1545:~$ sudo apt-get install libavcodec-extra-53
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libavcodec-extra-53 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
However the following packages replace it:
  libav-tools

E: Package 'libavcodec-extra-53' has no installation candidate
bushmaster@bushmaster-Inspiron-1545:~$ sudo apt-get install ffmpeg libavcodec-unstripped-52
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package ffmpeg 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

E: Package 'ffmpeg' has no installation candidate
E: Unable to locate package libavcodec-unstripped-52
bushmaster@bushmaster-Inspiron-1545:~$