sudo apt-get install transmission-daemon

sudo service transmission-daemon stop

sudo nano /etc/init.d/transmission-daemon

Edit the USER line to match your user

USER=youruser

Save

sudo chown -R youruser:youruser /etc/transmission-daemon/

sudo chown -R youruser:youruser /var/lib/transmission-daemon/

sudo chown -R youruser:youruser /usr/share/transmission/

nano /etc/transmission-daemon/settings.json

Edit these lines accordingly:

    "download-dir": "/mnt/torrents",

    "rpc-password": "apasswordofyourchoosing", #The password gets hashed and replaced when the daemon starts.

    "rpc-username": "ausernameofyourchoosing",

    "rpc-whitelist-enabled": false, #Make sure this is false if you want to be able to access it via LAN or internet (after forwarding port)

Save

sudo service transmission-daemon start