Comment # 7 on bug 1152720 from Luigi Baldoni

> I see this here frm log file
> E [02/Oct/2019:16:35:36 +0200] Unable to open listen socket for address [v1.::1]:631 - Cannot assign requested address.
> E [02/Oct/2019:16:36:05 +0200] [CGI] cups-brf must be called as root
> E [02/Oct/2019:16:36:05 +0200] [cups-deviced] PID 20167 (cups-brf) stopped with status 1!
> E [02/Oct/2019:16:36:05 +0200] [cups-deviced] PID 20172 (gutenprint52+usb) stopped with status 1!

My /var/log/cups/error_log shows all of the above since at least June 2018.

> E [02/Oct/2019:16:36:15 +0200] [Job 221] Job stopped due to filter errors; please consult the error_log file for details.

This instead has appeared only since the 1st of October 2019 when gutenprint
9.27 was pushed (and before setting the loglevel to debug).