/etc/X11/app-defaults/XMore is in x11-apps 7.6+5ubuntu1.
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 30 31 32 33 | ! XMore.ad
! keyboard translations
*text.Translations: #override\n\
        Ctrl<Key>S:     no-op(RingBell)\n\
        Ctrl<Key>R:     no-op(RingBell)\n\
        <Key>space:     next-page()\n\
        <Key>F:         next-page()\n\
        Ctrl<Key>B:     previous-page()\n\
        <Key>B:         previous-page()\n\
        <Key>K:         scroll-one-line-down()\n\
        <Key>Y:         scroll-one-line-down()\n\
        <Key>Return:    scroll-one-line-up()\n\
        <Key>J:         scroll-one-line-up()\n\
        <Key>E:         scroll-one-line-up()\n\
        <Key>q:         quit()\n
*text.baseTranslations: #override\n\
        <Key>space:     next-page()\n\
        <Key>F:         next-page()\n\
        Ctrl<Key>B:     previous-page()\n\
        <Key>K:         scroll-one-line-down()\n\
        <Key>Y:         scroll-one-line-down()\n\
        <Key>Return:    scroll-one-line-up()\n\
        <Key>J:         scroll-one-line-up()\n\
        <Key>E:         scroll-one-line-up()\n\
        <Key>q:         quit()\n
! tip messages
*quit.tip:  Quit application
*international:		True
! EOF.
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