Things I like to do after a fresh install of elementary os loki 0.4

setup-after-loki.sh

#Updating system packages to latest version
sudo apt-get update && sudo apt-get upgrade 

#Install Software properties
sudo apt-get install software-properties-common

#Install elementary tweaks
sudo add-apt-repository ppa:philip.scott/elementary-tweaks && sudo apt-get update
sudo apt install -y elementary-tweaks

#Install TLP for battery saving
sudo add-apt-repository ppa:linrunner/tlp && sudo apt-get update
sudo apt-get install tlp tlp-rdw
sudo tlp start

#Install Firefox Latest
sudo add-apt-repository ppa:mozillateam/firefox-next && sudo apt-get update
sudo apt install -y firefox

#Install Gdebi - to handle .deb files -> take a look at eddy for GUI
sudo apt install -y gdebi

#Install Media Codecs
sudo apt-get install ubuntu-restricted-extras

#Install archive support
sudo apt install rar unrar cabextract lzip lunzip unace p7zip-rar p7zip

#Install Transmission downloader
sudo apt install transmission

For Intel i3,5,7:
sudo apt-get install intel-microcode

For AMD:
sudo apt-get install amd64-microcode