Can you reinstall the CUPS package with

sudo apt-get install --reinstall cups

in a terminal window, simply to see whether the package installation
sets the correct directory permissions for you?

Check with

ls -l /usr/lib/cups/backend

whether permissions are correct and tell us whether there are correct
for you now.

If not run

chmod go+rx /usr/lib/cups/backend

again to be able to print for the time being.

-- 
cups fails to print with backend permission problem
https://bugs.launchpad.net/bugs/596611
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