This would be a whole lot simpler if "Lock Version" worked in Synaptic but based on the last comment from the Ubuntu bug report it doesn't look promising:
#4 Pedro Villavicencio wrote on 2009-07-16:
Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? May you please try the same with Jaunty and comment back? Thanks in advance.
You might consider posting a bug report to the Mint Bug Forum viewforum.php?f=166
. There is a feedback channel between Mint and Ubuntu. I submitted a bug report on nautilus-shares which ended up in the Ubuntu bug report. With emorrp1's help this looks like it's going to be fixed. In fact he pretty much pulled it out of the fire because it looked to me that Ubuntu was going to close it.