VIM has become by go to editor for Ubuntu.  VI iMproved is an improved version of vi.  I like blue the best

cd /usr/share/vim/sudo vim vimrc

” All system-wide defaults are set in $VIMRUNTIME/debian.vim and sourced by
” the call to :runtime you can find below.  If you wish to change any of those
” settings, you should do it in this file (/etc/vim/vimrc), since debian.vim
” will be overwritten everytime an upgrade of the vim packages is performed.
” It is recommended to make changes after sourcing debian.vim since it alters
” the value of the ‘compatible’ option.
colorscheme blue
runtime! debian.vim

Some of the other colors are:

blue.vim
darkblue.vim
default.vim
delek.vim
desert.vim
elflord.vim
evening.vim
koehler.vim
morning.vim
murphy.vim
pablo.vim
peachpuff.vim
ron.vim
shine.vim
slate.vim
torte.vim
zellner.vim