I just did a successful upgrade to my netbook from Saucy to Trusty using:
I had to try a couple of time, because the Canadian mirror doesn't seem to be completely up to date. Once I changed to the Main mirror, the upgrade went off without a hitch. I also changed the mirror from Canada to Main on my desktop system and found several updates that weren't showing previously.Code:do-release-upgrade -d
For those not using the Main mirror, it may be an idea to switch to it, to benefit from all the latest updates.