Do not edit /etc/cups/printers.conf while cupsd is running, as cupsd is modifying it. So first stop cupsd:
sudo systemctl stop cupsd
then edit the file and after that start cupsd again:
sudo systemctl start cupsd
Note that you only can edit the properties of permanent print queues. Queues which get temporarily created by CUPS or cups-browsed will loose the changes once they get removed and re-created.
Do not edit /etc/cups/ printers. conf while cupsd is running, as cupsd is modifying it. So first stop cupsd:
sudo systemctl stop cupsd
then edit the file and after that start cupsd again:
sudo systemctl start cupsd
Note that you only can edit the properties of permanent print queues. Queues which get temporarily created by CUPS or cups-browsed will loose the changes once they get removed and re-created.