Hey Gavin,
To be frank with you, we do not have exact experience to setup this from the Ubuntu server regarding this cronjob configuration.
But i believe it quite similar with other setup, did you know your server did support wget?
If yes, can you consult with your webhosting provider and see what is the correct wget path from your server? Because it need to use to setup following cronjob command.
Once you know your Wget path :
1. Open your SSH server
2. type this
export EDITOR=nano
3. type this
crontab -e
4. I believe it will show tab which allow you type following command.
5. this
usr/bin/wget you have to replace to use your server Wget path
[gist type="php"]
*/5 * * * * /usr/bin/wget -O /dev/null "
http://yoursite.com/index.php?option=com_easysocial&cron=true"
[/gist]
Most of the step is quite similar with this reference link (
https://help.ubuntu.com/community/CronHowto) like what my colleague shared to you in earlier.
if you still need assistance on this, perhaps you can provide us with your following access so we can better have a look.
- Joomla backend access
- FTP access
- SSH access