This line is already in the us layout,
key BKSL {[ backslash, bar] };
See /etc/X11/xkb/symbols/us.
Thanks for the report.
** Changed in: xkeyboard-config (Ubuntu)
Status: New = Fix Released
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backslash symbol is not defined in /etc/X11/xkb/symbols/us
** Changed in: xkeyboard-config (Ubuntu)
Sourcepackagename: None = xkeyboard-config
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backslash symbol is not defined in /etc/X11/xkb/symbols/us (in the basic set)
https://bugs.launchpad.net/bugs/175114
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Bugs, which is the bug