I identified the issue by running `cups -t` to check config and solved
it by commenting out. Since I run etckeeper I could track the change and
date in config back to 2024. So there seems to be a change in a recent
update that cupsd now bails out with an error.
I cannot recall what exactly caused the changes, but there were no
package installations or upgrades involved - I guess there were manual
changes of printers.
```
commit e78e94c42814551931d816fb35bac450dcec280b
Author: root <root@mom>
Date: Mon May 24 07:40:14 2021 +0200
daily autocommit
# git diff e78e94c42814551931d816fb35bac450dcec280b cupsd.conf
diff --git a/cups/cupsd.conf b/cups/cupsd.conf
index 698e374..0f6b6ce 100644
--- a/cups/cupsd.conf
+++ b/cups/cupsd.conf
@@ -1,7 +1,7 @@
-LogLevel warn
+# Show troubleshooting information in error_log.
+LogLevel debug
PageLogFormat
MaxLogSize 0
-# Allow remote access
Port 631
Listen /run/cups/cups.sock
Browsing On
@@ -9,7 +9,6 @@ BrowseLocalProtocols dnssd
DefaultAuthType Basic
WebInterface Yes
<Location />
- # Allow remote access...
Order allow,deny
Allow all
</Location>
@@ -119,3 +118,7 @@ WebInterface Yes
Order deny,allow
</Limit>
</Policy>
+#JobPrivateAccess default
+#JobPrivateValues default
+#SubscriptionPrivateAccess default
+#SubscriptionPrivateValues default
```
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https://bugs.launchpad.net/bugs/2133406
Title:
CUPS fails to start after update 2.4.7-1.2ubuntu7.7 due to invalid
directives appended to cupsd.conf
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/2133406/+subscriptions
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