Control: tags 1129212 patch
It seems the bug occurs because /usr/lib/cups/backend/usb attempts to read
the root directory (/), and that is denied by apparmor. While I have not
investigated why the USB backend does this, I suggest simply allowing it.
It's a pretty harmless operation.
The attached patch fixes the bug for me.
diff --git a/debian/local/apparmor-profile b/debian/local/apparmor-profile
index 947cbd8..fb7e03e 100644
--- a/debian/local/apparmor-profile
+++ b/debian/local/apparmor-profile
@@ -52,6 +52,7 @@
# notification socket
/run/systemd/notify w,
+ / r,
/{usr/,}bin/bash ixr,
/{usr/,}bin/dash ixr,
/{usr/,}bin/hostname ixr,
