[Re-CC'ing the list because I don't think this is secret or private.] Bruce Campbell wrote:

On 24/2/20 11:25 am, Trent W. Buck wrote:

...

"Before you try any traditional vendor shit, see if the modern "driverless" approach works" etc. Thanks for input Trent, have gone through "driverless" approach with help from user on Mint Forum.

From your post tried changing <-o sides=two-sided-long-edge> to <-o duplex=duplexnotumble> [but it] still prints out 2 single sided sheets.

I found the support page here: https://support.hp.com/us-en/product/samsung-clx-6260-color-laser-multifunct... It looks like most or all 6260 models do at least *have* duplex print hardware. i.e. it's NOT simply that you're trying to print two-sided on a single-sided printer. I am too lazy to read the full manual. I would try poking around in the menus in case e.g. duplex module is turned off for some stupid reason. Good luck!