I found out that "gtk-auto-mnemonic = 0" is supposed to turn the underlined keyboard shortcuts back on but neither "gtk-auto-mnemonic = 0" nor "gtk-auto-mnemonic = 1" at the end of every theme file made any difference.
Is this advice only valid for Gnome 2?
How can I make the shortcuts always visible, 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 verified with (both with zero and one, as I tried both):
~$ 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
Try:
$ dconf write /org/gnome/desktop/interface/automatic-mnemonics false
According to its schema: Only show mnemonics on when the Alt key is pressed. Whether mnemonics should be automatically shown and hidden when the user presses the Alt key..
Alternatively, you can use dconf-editor to change the value.
You will need to re-start the application in order the change makes effect.