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SystemGroup stopped supporting spaces in a recent version
See bug #5041
For years we've had cups-based Linux print servers with a setting:
SystemGroup "Printer Administrators"
After upgrading from Debian 12 (Bookwork) running cups 2.4.2-3+deb12u9 to Debian 13 (Trixie) running cups 2.4.10-3+deb13u1, that setting prevents cups from running.
Replacing it with SystemGroup "printer-administrators" works, but will require us to change groups on hundreds of networks.