I run Mint mostly on my desktop systems and realvnc isn't in the repos, so I use tightvnc.  Now the Raspberry pi defaults to realvnc as it's server and I wasn't able to get tightvnc to talk with it so I installed tightvnc server to the pi but it doesn't come up at boot like I want it to.  

This pi is behind a firewall so I'm not much concerned with the security of having a vncserver running all the time.  I elected to use the @reboot feature of crontab to bring up the server.  Here's my crontab script running as the user pi.

<code>
USER=pi
# Edit this file to introduce tasks to be run by cron.
# 
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
# 
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').# 
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
# 
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
# 
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
# 
# For more information see the manual pages of crontab(5) and cron(8)
# 
# m h  dom mon dow   command
@reboot /usr/bin/vncserver -geometry 1600x1024 >/tmp/c.out 2>&1 &
</code>

Don't miss the USER environment variable.  It won't work without it.