I have an att uverse router. When I try to enter the WPA Passphrase it says my passphrase is invali

I have a Officejet 4500 Wireless printer Model G510n.  My internet is att cable and I run Ubuntu 11.11 as my operating system.  I can't get my HP printer set up.  When I enter my network password I get an error message that my WPA Passpharse is invalid.

I had a similar issue.  We recently had AT&T U-verse installed.  Our printer, a J4680C Office Jet is connected to the desktop by USB cable and it was printing fine from there; however the printer was no longer being recognized by my laptop.  I could manually add it but every time I printed; the print job just read Error-Printing.
I knew I needed to set up my printer to see the correct network 2WIREXXX (SSID) and I had a Network Access Key (passphrase/WPA) from the side of my RG (residential gateway/router) but every time I entered that number the printer told me it was invalid.  I did some research, spent hours trying the solutions which included uninstalling and reinstalling the entire printer and software, down-loading new drivers, banging my head against the wall, etc.
I finally called AT&T to no avail; they referred me to HP for support, who said they could help but I’d need to pay for advice since my printer was an older model.  I was feeling very frustrated by this point and I am sharing what turned out to be user error in the hope of saving someone else some aggravation.
Here’s the deal, each time the message PASSPHRASE was displayed on the printer menu screen, I was hitting the forward arrow button and entering my PASSPHRASE or WPA or Network Access Key on the blank line.  Little did I know but each time I did that, I was inadvertently adding a space in front of the passphrase!  I kept getting the error message “invalid passphrase”, so my printer wasn’t part of my network and couldn’t be seen by other devices wirelessly.
I finally tried this.  As soon as the word passphrase comes up; do not arrow forward, just immediately enter the WPA number.  LOOK carefully at your WPA to make sure it is exact; no spaces in front or extra characters on the end (an i came up on my printer).  If it does, just arrow back one time to erase it.  When you are ready, hit OK and voila!  Problem solved and my laptop now sees the wireless printer, is happily printing and my husband is allowed to talk out loud again. Hope this helps someone else avoid the same mistake!

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