This file is indexed.

/usr/share/themes/Blubuntu/index.theme is in blubuntu-look 0.3.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Desktop Entry]
Type=X-GNOME-Metatheme
Name=Blubuntu
Comment=A nice blue theme
Comment[bs]=Fina plava tema
Comment[ca]=Un agradable tema blau
Comment[cs]=Pěkný modrý motiv
Comment[de]=Ein nettes blaues Theme
Comment[el]=Ένα ωραίο μπλε θέμα
Comment[en_CA]=A nice blue theme
Comment[en_GB]=A nice blue theme
Comment[es]=Un bonito tema azul
Comment[fi]=Miellyttävä sininen teema
Comment[fr]=Un joli thème bleu
Comment[gl]=Un fermoso tema azul
Comment[he]=ערכת נושא כחולה נחמדה
Comment[hi]=एक अच्छी सी नीली थीम
Comment[hu]=Egy csinos kis kék téma
Comment[id]=Seubah tema biru yang cantik
Comment[is]=Fallega blátt útlit
Comment[it]=Un piacevole tema blu
Comment[ja]=いい感じの青色テーマ
Comment[lt]=Graži mėlyna tema
Comment[ml]=ഒരു കിടിലം നീല തീം
Comment[mr]=एक छान नीली थीम
Comment[nb]=Et pent blått tema
Comment[nl]=Een mooi blauw thema
Comment[nn]=Eit flott tema i blått.
Comment[oc]=Un polit tèma blau
Comment[pl]=Ładny niebieski motyw
Comment[pt]=Um tema azul agradável
Comment[pt_BR]=Um agradável tema azul.
Comment[ro]=O temă albastră draguţă
Comment[ru]=Изящная голубая тема
Comment[sk]=Pekná modrá téma
Comment[sr]=Лепа плава тема
Comment[sv]=Ett trevligt blått tema
Comment[te]=చక్కని నీలపు అలంకారం
Comment[th]=ธีมสีฟ้าสวยๆ
Comment[tr]=Güzel mavi bir tema
Comment[zh_CN]=一个漂亮的蓝色主题
Comment[zh_HK]=漂亮的藍色主題桌面
Encoding=UTF-8

[X-GNOME-Metatheme]
GtkTheme=Blubuntu
IconTheme=elementary-monochrome
MetacityTheme=Blubuntu
BackgroundImage=/usr/share/backgrounds/Ubuntu-Blubuntu_1600x1200.png