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  • I installed my bitcoind and lnd correctly.

  • I put my datadir=/mnt/vdb to bitcoind.conf file and it allows me to start bitcoind with this command: bitcoind -daemon.

  • As a final step, I want to learn lnd

    sudo service lnd start

    Failed to start lnd.service: Unit bitcoind.service not found.

For me, I don't understand why it can't find bitcoind.service since I could run bitcoind without --datadir parameter.

How do I fix this error?

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Starting a service by hand doesn't mean that it has the proper init.d or systemd config files in place that it could be started with the service command. In this case it looks like lnd was setup to assume that bitcoind was also a systemd service so it can make sure it is started first. If you can't start bitcoind with the service command then something is missing.

  1. Maybe you didn't install bitcoind correctly and didn't realize it. Look at the files that were installed and see if anything got put into /usr/lib/systemd/system/unit or /etc/systemd/system/unit.d/ directories.
  2. Or lnd has expectations that have drifted from what bitcoind is providing over some period of time. The "easy" work around is to modify the systemd config for lnd to no longer try to start bitcoind.

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