The entire Stack Exchange network is under constant attack by spammers. You just happened to visit at an unfortunate time -- these posts are often deleted within secondsminutes if not minutesseconds.
The Charcoal volunteer organization coordinates efforts to respond to spam which gets through the site admins' blocks (which allegedly already stop 90% of the deluge).
Charcoal collects records in a system called Metasmoke -- here are the recent hits for Ask Ubuntu:
https://metasmoke.erwaysoftware.com/search?feedback_filter=tp&site=29