/boot/grub/themes/ubuntu-mate/theme.txt is in grub2-themes-ubuntu-mate 0.3.7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2014 nadrimajstor <ipejic@gmail.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
# general settings
title-color: "white"
message-color: "black"
message-bg-color: "gainsboro"
desktop-image: "background.png"
desktop-color: "#3c3b37"
# boot menu
+ boot_menu {
left = 10%
width = 80%
top = 20%
height = 50%
item_color = "black"
selected_item_color = "black"
icon_width = 16
icon_height = 16
item_height = 33
item_padding = 1
item_icon_space = 1
item_spacing = 1
menu_pixmap_style = "menu_frame_*.png"
selected_item_pixmap_style = "highlight_*.png"
}
# progress bar
+ progress_bar {
id = "__timeout__"
left = 10%
width = 80%
top = 75%
height = 25
show_text = true
text_color = "white"
text = "@TIMEOUT_NOTIFICATION_MIDDLE@"
bar_style = "progress_frame_*.png"
highlight_style = "progress_highlight_*.png"
}
# help bar at the bottom
+ hbox {
top = 100%-35
left = 13%
+ label { text = "↑↓" color = "#87a556" }
+ label { text = ":select " color = "gainsboro" }
+ label { text = "enter" color = "#87a556" }
+ label { text = ":boot " color = "gainsboro" }
+ label { text = "e" color = "#87a556" }
+ label { text = ":edit " color = "gainsboro" }
+ label { text = "c" color = "#87a556" }
+ label { text = ":command-line" color = "gainsboro" }
}
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