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Your SIGBUS error could be due to not enough swap space. You could use htop to check.
What is your bitcoin.conf and electrs.conf configuration, minus RPC info.
You can manually check the RPC connection like this if you're using RPC username and password:
bitcoin-cli -rpcuser=your_rpc_username -rpcpassword=your_rpc_password getblockchaininfo
I'm not a real technical guy. I do know I had ZeroMQ enables, and a transaction index. I don't know if that helps.
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I need to install core first, but I think I can tell you if you have specific questions, since I set it up how embassy recommended
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