The bug is indeed fixed with the new package on Quantal:
till@till:~$ ll /usr/lib/cups/backend/serial -rwx------ 1 root root 14600 Dec 29 14:31 /usr/lib/cups/backend/serial till@till:~$
The permissions of the serial backend are correct.
The bug is indeed fixed with the new package on Quantal:
till@till:~$ ll /usr/lib/ cups/backend/ serial cups/backend/ serial
-rwx------ 1 root root 14600 Dec 29 14:31 /usr/lib/
till@till:~$
The permissions of the serial backend are correct.