For no reason that I can figure, my Raspbian install on my Pi stopped letting me sudo. I've been able to get into a kind of single-user mode using this page, but now that I'm there, I can't figure out what the error is. I've compared it to the sudoers file on my Pi 2, and they look nearly identical. It says there's a syntax error near line 27. Here's what I see in visudo:
Any help would be appreciated.