I found out that I "gtk-auto-mnemonic = 0"must turn on the underlined keyboard shortcuts again, but neither "gtk-auto-mnemonic = 0", nor "gtk-auto-mnemonic = 1"at the end of each file of the theme has changed.
Is this tip valid for Gnome 2 only?
How to make shortcuts always visible, and not just when I press ALT?
I did it with
locate gtkrc | grep themes | xargs -I @ echo "echo \"gtk-auto-mnemonics = 0\" >> @" | sudo sh
And it is checked using (both with zero and one, as I tried):
~$ locate gtkrc | grep themes | xargs grep auto
/usr/share/gimp/2.0/themes/Default/gtkrc:gtk-auto-mnemonics = 1
/usr/share/gimp/2.0/themes/Small/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Adwaita/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Adwaita/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Clearlooks/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Crux/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Default/gtk-2.0-key/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Emacs/gtk-2.0-key/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/HighContrast/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/HighContrastInverse/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Industrial/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/LowContrast/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Mist/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Raleigh/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/Redmond/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/ThinIce/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
/usr/share/themes/bubble/gtk-2.0/gtkrc:gtk-auto-mnemonics = 1
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