/usr/share/xfce4/terminal/colorschemes/xubuntu-light.theme is in xubuntu-artwork 18.04.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | [Scheme]
Name=Xubuntu Light
ColorForeground=#1f3566
ColorBackground=#f1f1f1
ColorPalette=#000000;#aa0000;#44aa44;#aa5500;#0039aa;#aa22aa;#1a92aa;#aaaaaa;#888888;#ff8787;#4ce64c;#ded82c;#295fcc;#cc58cc;#4ccce6;#ffffff
ColorSelection=#bbbbbb
ColorSelectionUseDefault=FALSE
ColorCursor=#0f4999
ColorBold=#000000
ColorBoldUseDefault=FALSE
TabActivityColor=#0f4999
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