root@APT:/etc/systemd/system# cat monerod.service
[Unit]
Description=Monero BlockChain
After=network.target

[Service]
Type=forking
PIDFile=/home/blockchain/monero.pid
ExecStart=/usr/bin/monerod --data-dir /var/BLOCKCHAIN/Mownero --pidfile /home/blockchain/monero.pid
User=blockchain
Group=blockchain

[Install]
WantedBy=multi-user.target
root@APT:/etc/systemd/system#

#------------------------------
systemctl start monerod
Job for monerod.service failed because the control process exited with error code.
See "systemctl status monerod.service" and "journalctl -xe" for details.
*------------------------------

-- A start job for unit monerod.service has begun execution.
--
-- The job identifier is 12743.
jun 28 13:19:25 APT kernel: perf: interrupt took too long (3131 > 3126), lowering kernel.perf_event_max_sample_rate to
jun 28 13:19:25 APT monerod[6969]: 2020-06-28 12:19:25.681        I Monero 'Nitrogen Nebula' (v0.16.0.1-release)
jun 28 13:19:25 APT monerod[6969]: 2020-06-28 12:19:25.681        I Initializing cryptonote protocol...
jun 28 13:19:25 APT monerod[6969]: 2020-06-28 12:19:25.681        I Cryptonote protocol initialized OK
jun 28 13:19:25 APT monerod[6969]: 2020-06-28 12:19:25.682        I Initializing core...
jun 28 13:19:25 APT monerod[6969]: 2020-06-28 12:19:25.682        I Stopping cryptonote protocol...
jun 28 13:19:25 APT monerod[6969]: 2020-06-28 12:19:25.682        I Cryptonote protocol stopped successfully
jun 28 13:19:25 APT monerod[6969]: 2020-06-28 12:19:25.682        E Exception in main! boost::filesystem::create_direct
jun 28 13:19:25 APT systemd[1]: monerod.service: Control process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- An ExecStart= process belonging to unit monerod.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
jun 28 13:19:25 APT systemd[1]: monerod.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit monerod.service has entered the 'failed' state with result 'exit-code'.
jun 28 13:19:25 APT systemd[1]: Failed to start Monero BlockChain.
-- Subject: A start job for unit monerod.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit monerod.service has finished with a failure.
--
-- The job identifier is 12743 and the job result is failed.