I'm trying to read and perhaps sign the Leadership Code of Conduct, but all I can find is this:
Back when the Code was in version 1.1, I could access the "regular" CoC 1.1 and the Leadership CoC that went along with it.
The Code of Conduct is now on version 2. Where is the corresponding Leadership Code of Conduct?
As of the Ubuntu Code of Conduct v2.0, there is no longer a separate Leadership Code of Conduct. Instead, CoC 2.0 covers both.
— Charles Profitt, "CoC Version 2.0 has been released" (official mailing list for Ubuntu News Team)
So now, the one CoC includes the expectations for leadership. And agreeing to CoC 2.0 corresponds to what was formerly achieved by agreeing both to CoC 1.1 and the Leadership CoC.
It makes sense that they are both collapsed into one as, after all, there are numerous opportunities for both participation and leadership in the Ubuntu community, most of which require no formal recognition (though some leadership positions are official, as always). CoC 2.0 makes this clear too:
— Ubuntu Code of Conduct v2.0