Submerge them in brine for a few weeks. This creates an environment favouring lactic acid bacteria which will create pickling acid from the veggies that prevents mould.

You need to keep them submerged which you can do by putting a freezer bag full of brine on top.

It’ll release CO2 so if you don’t have airlocks you’ll need to seal the jars only loosely or burb them occasionally.

This reminds me of the book “Only you can save mankind” by Terry Pratchett. The aliens surrender once they realise the player is apparently immortal!

When you use the KDE Desktop Environment it will also show notifications from your phone and sync media controls (e.g. stop playback when you get a phone call). It’s great!