Here’s how to do it – if you have the desktop version, most of the hard work has been done for you, but here’s how to open the web interface up to the world/your LAN anyway.

I’ve made a new directory in the root of the drive for files, called transmission.

1. sudo apt-get install transmission-cli transmission-daemon
2. cd /
3. sudo mkdir transmission
4. sudo chgrp -R debian-transmission /transmission 
5. sudo chmod -R 775 /transmission
6. sudo service transmission-daemon restart
7. sudo nano /etc/transmission-daemon/settings.json
8. make edits to file:
   1. “download-dir”: “/transmission”,
   2. “rpc-password”: “your-password”,
   3. “rpc-port”: abcd
   4. “rpc-whitelist”: “127.0.0.1,192.168.*.*”,
      the password will be hashed on the next restart.
9. sudo service transmission-daemon reload
   
10. sudo service transmission-daemon restart
11. enjoy vie web interface. 😀
12. remember to push a port through your firewall….

If you want to do this from the server distro, you’ll need to install ‘transmission-common’ also.