/etc/PackageKit/PackageKit.conf is in packagekit 1.1.5-2+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | # Only the system administrator should modify this file, ordinary users
# should not have to change anything.
[Daemon]
# Default backends, as chosen in the configure script. This will be used
# where no --backend="foo" option is given to the daemon.
#
# The order they are specified is the order they are tried, so for the
# value "foo,bar" first "foo" will be attempted and then "bar" if the
# libpk_backend_foo.so module load failed.
#DefaultBackend=auto
# Unlock the backend after this many seconds idle.
#BackendShutdownTimeout=5
# Shut down the daemon after this many seconds idle. 0 means don't shutdown.
#ShutdownTimeout=300
# Keep the packages after they have been downloaded
#KeepCache=false
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