I’ve done this on both Linux Mint 19, an old Macbook and Ubuntu 19.04 fyi.
- Download Sims 3 or another legacy game from Lutris Website it should say Open XDG-Open on your Firefox or Chromium (not Chrome) Browser. It will open in Lutris.
- You don’t need Sims 3 or the legacy installer game you choose, the reason why you should do it this way if you have little to no coding knowledge so you don’t mess up your wine configurations. Do not actually install Sims 3 once you are logged in, install your game after lutris goes through it’s normal configuration step.
- Next, disable game updates and as you are installing your chosen game, disable Origin-In Game and select in your settings “ignore non-mandatory updates.” Now the "origin online not available message has disappeared.
IMPORTANT: Just know when you access your files to add your game mods or scripts it will be under the folder /home/user/Games/the-sims-3/drive_c/users/user/My Documents/Electronic Arts/"Game Name"Sims 3 folder will act as an aggregator on the virtual drive even if you don’t have sims 3 installed.
I was able to add my mods to Sims 4 as well as access Battlefield and other games. Hope that helps. Also don’t forget to donate to Lutris, Linux and the open source community!