Comment 7 for bug 1108637

The upstream (692852 has been marked as dublicate)

https://bugzilla.gnome.org/show_bug.cgi?id=679822

has been marked as fixed:

Cosimo Cecchi [nautilus developer] 2012-08-23 10:11:03 UTC

"
Pushed a fix for [...ALT+ < >]to git master now.
"

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If there is a broader need for the "BACKSPACE" feature the configuration change mentioned upstream by

James 2013-01-31 02:34:19 UTC

"
Not sure if it's going to be a default, but you'll need to add this:

(gtk_accel_path "<Actions>/ShellActions/Up" "BackSpace")

to ~/.config/nautilus/accels to get Backspace back.

HTH for someone reading here.
"

must be incorporated in the ubuntu package independend of the upstream as far as I could see.