I had my fair share of troubles with umbrelOS too. Running on a rather old cpu (dualcore-i3) it was also extremly slow and laggy. Works a lot smoother since I did the last update a couple of days ago. I'll see how long that lasts.

Ubuntu will also work of course, it's a little more work to hack all those commands into your keyboard and keep everything up to date, while you just have to click some buttons and wait in umbrel.

I'm always running electrs in between my BTC- and LN-node, need it for my SPV-clients anyway, but it should work without too.

To lower you initial costs you can save a lot on fees by batch-opening multiple channels in one on-chain-Tx, using tools like BoS, or LNDg.

I could also open up a channel to get you some inbound liquidity and maybe send some sats thru it to pay for your first outbound-channels and get you started.

Just gimme a wink when you're ready.

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Thanks for your guidence so far. I'm looking into the ubuntu installtion of the bitcoin node on the VM server I am renting. (TBH IDK if this is even allowed, but I'd rather try it and see what happens)

I'm using GPT for guidence, but for teh most part it seems relatively straight forward...

Yes, I explicitly want to keep my costs low as this is coming out of my own pocket for public usage. So ideally, as economical as possible. I ain't looking to turn a profit either, but don't want it to drain me within 6 months.