Install a PDF printer in 30 seconds on Ubuntu

Installing a PDF printer on Ubuntu will take no more than half minute:

• open a Terminal (search Terminal in the Menu or CTRL+ALT+T)
• type sudo apt-get install cups-pdf, then press Enter
• insert your password to allow installation (it will seem you're not typing for security reasons), then press Enter again
• wait until the installation finishes

You can now print your documents to PDF files choosing the printer named "PDF"; they will be saved by default in the folder PDF in your home.

provisional solution for /usr/lib/cups/backend/hp failed

Since a few weeks I get this error when i try to print any document with my HP printer:

/usr/lib/cups/backend/hp failed

I spent hours googling for a solution, but none of the ones i found seems to work for me.
Then accidentally I did the following steps, and my printer started to work.
I don't know if it was by chance, or why it works, but if you haven't found a solution yet maybe you can try this one too:

• turn off and then again on your printer
• print the document
• you should get a notification that the document has been printed, but the printer didn't move and the document is still in the print queue
• go to the print queue and refresh job list (the blue curved arrow)
• your doc should be held for about 5 minutes
• turn off your printer and wait until the document will not be held, its status should become "pending"
• turn on the printer; the doc should be printed

I hope it works for those who haven't found a solution for weeks..

let me know!

P.s.: obviuosly this is a provisional solution, it doesn't solve the problem..