請教:
在 Ubuntu 14.04 要安裝 Canon SELPHY CP760相片印表機, 老是失敗. 總出現 'client-error-not-possible' 訊息。
Google 了許久, 找到這個 http://askubuntu.com/questions/492200/installing-cp400-printer-gives-client-error-not-possible-error

「I was running into the same issue with a different printer. Your comment about the plus sign provided me a clue. When I tried adding the plus sign to 'gutenprint52usb://' in the 'add printer' menu it looked like it didn't accept it. So since I couldn't add a + in the menu, I subtracted it from the library name by making a copy of gutenprint52+usb without the plus sign

# cd /usr/lib/cups/backend
# cp gutenprint52+usb gutenprint52usb

After that, I just added the printer like normal (select device, find driver, save) and was able to print successfully.」
然後就裝完了...
可是列印時, 印表機卻沒有反應... 可以見到送出列印的檔案, 都在待列印佇列中。
有朋友可指點嗎?

奇怪!
刪掉印表機, 重新安裝一次, 裝完, 問"要不要列印測試頁?"
選擇 列印, 測試頁列印是成功的。
再要它印照片, 又一樣, 檔案在 待列印佇列裡, 印表機卻不動...

刪除印表機, 重裝。
這一回成功了!
原因不明!