I'm using the following:
64 bit Ubuntu 12.04.3 LTS
LibreOffice Version: 4.3.0.0.alpha0+ Build ID: be4035d00f37c492494fa7860955b6d0868c7f77
  (This is required because of some bugs in 4.2 and below that affect me)
HP OfficeJet 6700 (w/Dual sided printing set as default)
CUPS 1.5.3
HP-LIP 3.14.4

Symptoms differ depending on whether the OS Printing dialog or LibreOffice printing dialog is in use. I'll take these one by one.

When printing a single page in LibreOffice apps, using the Operating System printing dialogs, the following is true:

a) I'm unable to select "current page" on the General tab, but must enter a specific page number under "Pages."
b) I am able to select "one-sided" on the Layout tab. (Proper behavior)
c) I've tested this in Writer, Draw and Impress. The labelling is somewhat inconsistent, but they all act the same. I didn't attempt to use Calc just because I got tired of experimenting.
d) Even so, once the single page is printed, the paper is "sucked back in" and fed through a second time. Nothing prints of course, but this is actually a potentially serious problem under some conditions which I'll explain momentarily.
e) Of importance, I think, is the fact that the left margin (on a landscape page - obviously this would be the top margin on a portrait page) is larger than it would typically be for a single sided page. Many printers I've had, including the current HP-6700 need to "reserve" some space (I guess to grab the paper) when printing double-sided. This belief by the printer that it is *supposed* to be printing in double sided mode might help to narrow down where the difficulty is.

When printing a single page in LibreOffice apps, using the LibreOffice printing dialogs, the following is true:
a) I AM able to select "current page" and, in fact, the current page (or slide) number is entered in the box for me. (Proper behavior)
b) The Properties tab seems to "hang" while loading (mostly just the outline of the new sub-dialog box is displayed), although I've found that if you click the mouse somewhere on the header, it immediately appears completely.
c) Attempting to select "off" under the Duplex options (i.e. single sided) causes blinking and flashing that's hard to describe, but I've very rarely been able to select "off" using the mouse as the cursor/highlight just keeps bouncing around. If, however, I just use the arrow keys, everything works.
d) When the single page is printed, the printer does not attempt to suck the paper back in. (Proper behavior)
e) On identical pages, using the LibreOffice dialogs permits the entire content to be printed without cutting off the left edge of the landscape pages. (Proper behavior)

The reason this is more important than the extra three second or so return trip through the paper flipper is that Hewlett-Packard (and other printer manufacturers) do not recommend using double sided printing when using stock above a certain thickness (e.g. card stock) because doing so raises the likelihood of jamming the mechanism. With a default setting of double sided (and why else would I have purchased a double sided printer?), when I need to print on card stock, the chances of forgetting to set one-sided would be my fault, but if I set it and the driver ignores that setting, that (I believe) is a bug.

It would seem that simply using only the LibreOffice dialogs would be a reasonable work-around, the flashing and needing to move between the mouse and keyboard unnecessarily is just trading one annoyance for another.

To be fair, this problem might appear as if it could be caused by Ubuntu, CUPS, HP-LIP, or LibreOffice, but I believe I've narrowed it down to LibreOffice simply because I don't experience these problems when printing from several other applications I regularly use. But I acknowledge that it might be caused by some weird interactions among the aforementioned applications.