When I browse the Internet (in any browser), there are extra ads. I thought it could be on my computer, tried Ubuntu live disk, and even there were these ads. Same ads are on my iOS and Android devices too. I did a hard reset on my mobile devices, but that didn't help either.
I think these ads come from either my ISP or my router. Can I have a virus in my router? How can I check it? Are there any other possible variants?