Release Notes: The DISPLAY variable is explicitly passed in the backend script in the showerror() function to avoid "Default env_reset" in /etc/sudoers. A check that "sudo" command can be executed was added, since some distributions are running CUPS under the "lp" user instead of the "root" user. The documentation was updated to note that the account that CUPS uses to run must be enabled to run "sudo" commands with NOPASSWD. A file permission problem was corrected. A check for a correct DISPLAY variable was added.