The NAT (Network Address Translation) settings are for enabling access to servers inside the LAN from the Internet. You've basically told your router...
That just confirms a storage subsystem issue ... or you were mistyping the command. New people who don't use tab-completion often mistype commands. ...
It means that you've got two packages on your system that can't be there both. One is pop-gnome-initial-setup, the other is gnome-initial-setup. One...