/usr/share/vim-scripts/colors/dusk.vim is in vim-scripts 20130814ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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" Maintainer: Ajit J. Thakkar (ajit AT unb DOT ca)
" Last Change: 2005 Nov. 21
" Version: 1.1
" URL: http://www.unb.ca/chem/ajit/vim.htm
" This GUI-only color scheme has a blue-black background
set background=dark
hi clear
if exists("syntax_on")
syntax reset
endif
let colors_name = "dusk"
hi Normal guifg=ivory guibg=#1f3048
" Groups used in the 'highlight' and 'guicursor' options default value.
hi ErrorMsg gui=NONE guifg=Red guibg=Linen
hi IncSearch gui=NONE guibg=LightGreen guifg=Black
hi ModeMsg gui=NONE guifg=fg guibg=bg
hi StatusLine gui=NONE guifg=DarkBlue guibg=Grey
hi StatusLineNC gui=NONE guifg=Grey50 guibg=Grey
hi VertSplit gui=NONE guifg=Grey guibg=Grey
hi Visual gui=reverse guifg=fg guibg=LightSkyBlue4
hi VisualNOS gui=underline guifg=fg guibg=bg
hi DiffText gui=NONE guifg=Yellow guibg=LightSkyBlue4
hi Cursor guibg=Green guifg=Black
hi lCursor guibg=Cyan guifg=Black
hi Directory guifg=LightGreen guibg=bg
hi LineNr guifg=MistyRose3 guibg=bg
hi MoreMsg gui=NONE guifg=SeaGreen guibg=bg
hi NonText gui=NONE guifg=Cyan4 guibg=#102848
hi Question gui=NONE guifg=LimeGreen guibg=bg
hi Search gui=NONE guifg=SkyBlue4 guibg=Bisque
hi SpecialKey guifg=Cyan guibg=bg
hi Title gui=NONE guifg=Yellow2 guibg=bg
hi WarningMsg guifg=Tomato3 guibg=Linen
hi WildMenu gui=NONE guifg=SkyBlue4 guibg=Bisque
"hi Folded guifg=MistyRose2 guibg=bg
hi Folded guifg=MistyRose2 guibg=#102848
hi FoldColumn guifg=DarkBlue guibg=Grey
hi DiffAdd gui=NONE guifg=Blue guibg=LightCyan
hi DiffChange gui=NONE guifg=white guibg=LightCyan4
hi DiffDelete gui=NONE guifg=LightBlue guibg=LightCyan
" Colors for syntax highlighting
hi Constant gui=NONE guifg=MistyRose3 guibg=bg
hi String gui=NONE guifg=LightBlue3 guibg=bg
hi Special gui=NONE guifg=GoldenRod guibg=bg
hi Statement gui=NONE guifg=khaki guibg=bg
"hi Statement gui=NONE guifg=#d7cd7b guibg=bg
hi Operator gui=NONE guifg=Chartreuse guibg=bg
hi Ignore gui=NONE guifg=bg guibg=bg
if v:version >= 700
hi SpellBad gui=undercurl guisp=Red guifg=fg guibg=bg
hi SpellCap gui=undercurl guisp=GoldenRod guifg=fg guibg=bg
hi SpellRare gui=undercurl guisp=Ivory guifg=fg guibg=bg
hi SpellLocal gui=undercurl guisp=SeaGreen guifg=fg guibg=bg
endif
hi ToDo gui=NONE guifg=DodgerBlue guibg=bg
hi Error gui=NONE guifg=Red guibg=Linen
hi Comment gui=NONE guifg=SlateGrey guibg=bg
"hi Comment gui=NONE guifg=Lavender guibg=bg
hi Identifier gui=NONE guifg=BlanchedAlmond guibg=bg
hi PreProc gui=NONE guifg=#ffa0a0 guibg=bg
hi Type gui=NONE guifg=NavajoWhite guibg=bg
hi Underlined gui=underline guifg=fg guibg=bg
" vim: sw=2
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