How do I install Nemo file manager?

Instructions since they added it to the repositories in 13.04+!

sudo apt-get update
sudo apt-get install nemo

Use the ones below if you want a slightly-more-up-to-date version.

DO NOT USE THESE IN 13.10, unless you aren't using a unity-based Ubuntu flavour.

To install the stable version of Nemo:

sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable
sudo apt-get update
sudo apt-get install nemo

To install the bleeding edge version:

sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-nightly
sudo apt-get update
sudo apt-get install nemo

Note: Nemo also shows up as Files in the dash, so the first instance of Files should hopefully be Nemo.

If you want to continue using Nautilus for drawing your desktop icons:

Show all the startup apps:

sudo sed -i 's/NoDisplay=true/NoDisplay=false/g' /etc/xdg/autostart/nemo-autostart.desktop

Then, uncheck the item under Startup Applications that says:

Files
Start Nemo desktop at login

Nemo without Cinamon

version 1.8.4

sudo add-apt-repository ppa:noobslab/mint    
sudo apt-get update    
sudo apt-get install nemo

Extra plugins

sudo apt-get install nemo-compare nemo-dropbox nemo-fileroller nemo-pastebin nemo-seahorse nemo-share nemo-preview nemo-rabbitvcs

source Noobslab: http://www.noobslab.com/2013/10/nemo-file-manager-with-extensions-for.html

To install the version (latest) 2.0.3 check this new post in webupd8: http://www.webupd8.org/2013/10/install-nemo-with-unity-patches-and.html