keyboard shortcut gnome-terminal (ctrl-tab) and (ctrl-shift-tab) in 12.04?

A way to configure this is by setting gsettings from the terminal itself (two commands):

gsettings set org.gnome.Terminal.Legacy.Keybindings:/org/gnome/terminal/legacy/keybindings/ next-tab '<Primary>Tab'
gsettings set org.gnome.Terminal.Legacy.Keybindings:/org/gnome/terminal/legacy/keybindings/ prev-tab '<Primary><Shift>Tab'

Source: the last comment in the bug report

Use dconf Editor. If it's not installed by default you can get it with sudo apt-get install dconf-tools. The shortcut can be modified at Org > Gnome > Terminal > Legacy > Keybindings.

This works for me in Ubuntu Gnome 16.04. Reference: https://bugzilla.gnome.org/show_bug.cgi?id=738325

Unfortunately assigning shortcuts with TAB key is a no go in Gnome (for whatever reason). So this will not work.

• Reference: https://bugzilla.gnome.org/show_bug.cgi?id=123994 and https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/162000
• Current discussion about the issue: https://mail.gnome.org/archives/desktop-devel-list/2009-November/msg00220.html

There is a way to do this in a hacky way, from the answer below type this in the terminal:

gsettings set org.gnome.Terminal.Legacy.Keybindings:/org/gnome/terminal/legacy/keybindings/ next-tab '<Primary>Tab'
gsettings set org.gnome.Terminal.Legacy.Keybindings:/org/gnome/terminal/legacy/keybindings/ prev-tab '<Primary><Shift>Tab'