How to solve the problem specified as:
Printer state message is:
'File usr/lib/cups/backend/usb"not available: no such file or directory'.
Warnings are listed below:
There is a missing print filter for printer 'Canon-TS8000-series'.
Your question is to the point, somehow the cups had been damaged. I suspect that it happened while I was trying to print photograph from the program "Digikam".
Meanwhile I have reinstalled cups and the problem was solved. So I can print. Stil have to try if printing from Digikam causes problems again. I do not blame the program as I may very well have chosen or filled out the wrong option before printing. Thanks for your reply, Miel
From Ubuntu 17.04, there is airprint support. It seems essentially all inkjet printers released in the last several years are supported; so it is likely this TS8000series was auto-set-up???? by ubuntu for you. If you right-click on the icon for this printer; that should be in the PRINTERS folder, it may say "driverless": this seems to show it is using the airprint mode. As an alternate, you can install the drivers Canon supply so go here https://www.canon-europe.com/support/consumer_products/products/fax__multifunctionals/inkjet/pixma_ts_series/pixma-ts8040.aspx?type=drivers&driverdetailid=tcm:13-1533040&os=Linux%20(64-bit)&language=EN and download and SAVE what will be cnijfilter2-5.40-1-deb.tar.gz and it should end up in your Downloads folder. Open a terminal; copy each command below; paste into the terminal; hit the ENTER key after each line is pasted ..
cd Downloads tar -zxvf cnijfilter2-5.40-1-deb.tar.gz cd cnijfilter2-5.40-1-deb sudo ./install.sh
the last command runs the install script; that should do all for you; please watch the terminal, as it may ask you questions
If you do install these drivers; the icon should have a slightly different name to your existing one: it would be useful for others to know; if the printing is different between the two; good luck