Have Lubuntu on a netbook. When navigating the web I now find popups such as waiting for ads... Also waiting for cache. Did not have this problem two months ago when first installed. Lubuntu shows no apps to address adware. Suposedly, Linux is not susceptible. Guidance sought.

What web browser are you using? FWIW, both Firefox and Chrome have addons for blocking popups and ads (adblocker and adblocker+). Install those, and 98% of the ads will be blocked and this problem should go away.

If it's waiting on ads then either the ads servers are slow or you have a dns issue.