/etc/skel/.Xdefaults is in xubuntu-default-settings 18.04.6.
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 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | ! xscreensaver ---------------------------------------------------------------
!font settings
xscreensaver.Dialog.headingFont: -*-dina-bold-r-*-*-10-*-*-*-*-*-*-*
xscreensaver.Dialog.bodyFont: -*-dina-medium-r-*-*-10-*-*-*-*-*-*-*
xscreensaver.Dialog.labelFont: -*-dina-medium-r-*-*-10-*-*-*-*-*-*-*
xscreensaver.Dialog.unameFont: -*-dina-medium-r-*-*-10-*-*-*-*-*-*-*
xscreensaver.Dialog.buttonFont: -*-dina-bold-r-*-*-10-*-*-*-*-*-*-*
xscreensaver.Dialog.dateFont: -*-dina-medium-r-*-*-10-*-*-*-*-*-*-*
xscreensaver.passwd.passwdFont: -*-dina-bold-r-*-*-10-*-*-*-*-*-*-*
!general dialog box (affects main hostname, username, password text)
xscreensaver.Dialog.foreground: #EDEDED
xscreensaver.Dialog.background: #202020
xscreensaver.Dialog.topShadowColor: #202024
xscreensaver.Dialog.bottomShadowColor: #202024
xscreensaver.Dialog.Button.foreground: #EDEDFF
xscreensaver.Dialog.Button.background: #444
!username/password input box and date text colour
xscreensaver.Dialog.text.foreground: #EDEDFF
xscreensaver.Dialog.text.background: #444
xscreensaver.Dialog.internalBorderWidth:24
xscreensaver.Dialog.borderWidth: 0
xscreensaver.Dialog.shadowThickness: 2
!timeout bar (background is actually determined by Dialog.text.background)
xscreensaver.passwd.thermometer.foreground: #A9B7C4
xscreensaver.passwd.thermometer.background: #202020
xscreensaver.passwd.thermometer.width: 8
!datestamp format--see the strftime(3) manual page for details
xscreensaver.dateFormat: %I:%M%P %a %b %d, %Y
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