I'm afraid this is the direct result of bug #388659, which means that visudo will now use vi by default. Vi is an editor with a rather different model of editing.
If you want to use nano, set your $EDITOR variable (eg, export EDITOR=nano), and then either use sudo -E to run visudo, or remove env_reset from sudoers.
I'm closing this as invalid, because it seems that it is actually the correct, documented behaviour of visudo (there is, after all, a reason for it to have that name). Discussions about changing this probably need to take place elsewhere.
(I'm assuming this isn't a prank about vi)
I'm afraid this is the direct result of bug #388659, which means that visudo will now use vi by default. Vi is an editor with a rather different model of editing.
If you want to use nano, set your $EDITOR variable (eg, export EDITOR=nano), and then either use sudo -E to run visudo, or remove env_reset from sudoers.
I'm closing this as invalid, because it seems that it is actually the correct, documented behaviour of visudo (there is, after all, a reason for it to have that name). Discussions about changing this probably need to take place elsewhere.