Currently, no antivirus for one of the few times ever, just:
Ubuntu LTS with default protection (firewall enabled) & Ubuntu Pro (free) with Ubuntu & all apps kept updated, Malwarebytes Browser Guard, AdGuard DNS free default public servers on router & in Ubuntu LTS, an ad blocker (Brave Browser's built-in ad blocker or uBlock Origin or Ghostery Ad Blocker depending on which web browser I am using), router's built-in firewall, web browser security & privacy settings turned on & up to highest or near highest settings, only install apps when necessary, and common sense.
Android & Google account with default protection turned on & up to the highest or near highest settings with Android & apps kept updated, AdGuard DNS default public servers, Brave Browser & Mozilla Firefox with uBlock Origin, only install apps when necessary, and common sense.