Mmap needs enlarging, HELP

Just to add to what marcobra has said:

The basic issue is that you appear to have a lot of sources in your sources list, and consequently the packaging system (apparently) runs out of cache room processing an update.

The solution is to increase the cache room, providing you have enough memory to increase it.

To increase it, do the following:
1.) Press alt-f2
2.) Type
gksudo gedit /etc/apt/apt.conf
and press Enter to run the command.
3.) Put into the file the following line:
APT::Cache-Limit 10485760;
4.) Save the file, close the editor.
5.) Try to update your package cache again. You can do that by going into Synaptic and click reload, or open a Terminal window and type:
sudo apt-get update

You can also increase the number (10485760) above even more, but keep it strictly less than your memory size. The number is the number of bytes to allocate to the cache, the number above is about 10MB, for reference. 20971520 would make it about 20MB etc.

T