Yeah, started working for me a few hours later.

And clicking on the activation link again shows »too many tries »

I signed up, got the activation email, clicked on that which took me to the login page.

Logging in shows me a message that I am not activated.

Weird.

I second the advice to switch to a different/previous/known good kernel. That has been the cause a most boot problems for me. I just had it happen on a VM a couple of weeks ago, so I switched to the old kernel, then removed the new kernel. I’ll wait for another kernel before upgrading.

It’s probably worth scanning your disk just in case as well.