This file is indexed.

/etc/PackageKit/PackageKit.conf is in packagekit 0.7.2-4ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Only the system administrator should modify this file, ordinary users
# should not have to change anything.

[Daemon]

# Should we log transactions to the database.
#
# default=true
TransactionLogging=true

# Use NetworkManager where available. If disabled, then NM state will be ignored.
#
# default=true
UseNetworkManager=true

# Use Connman where available. If disabled, then Connman state will be ignored.
#
# default=false
UseNetworkConnman=false

# If neither NetworkManager nor ConnMan is not available, then use the presence
# of default route to indicate a viable network connection.
# If disabled, and no NM or CM, then the network is assumed to be always online.
#
# default=true
UseNetworkHeuristic=true

# If we should use the estimated time value.
# This will be inaccurate where backends do not send proportional percentage
# changed signals, or when updates are not frequent enough.
# Estimated time will then only be used when the prediction accuracy is high
# enough and will not be set at the very start or end of a transaction.
#
# default=true
UseRemainingTimeEstimation=true

# Shut down the daemon after this many seconds idle. 0 means don't shutdown.
#
# default=300
ShutdownTimeout=300

# Unlock the backend after this many seconds idle.
#
# default=5
BackendShutdownTimeout=5

# Set the priority of the spawned backend to this priority.
# This ensures the process does not hog the system when performing actions.
#
# Values range from -20 (most favorable) to 19 (least favorable)
# A niceness value of 0 will not attempt to set any priority.
#
# default=0
BackendSpawnNiceValue=0

# Set the priority of the spawned backend to this priority for low priority tasks.
# This ensures the process does not hog the system when performing actions.
#
# Values range from -20 (most favorable) to 19 (least favorable)
# A niceness value of 0 will not attempt to set any priority.
#
# default=10
BackendSpawnNiceValueBackground=10

# Set the iopriority class of the spawned backend to idle.
# This ensures the process does not hog the disk when performing actions.
#
# default=true
BackendSpawnIdleIO=true

# Set the iopriority class of the spawned backend to idle for low priority tasks.
# This ensures the process does not hog the disk when performing actions.
#
# default=true
BackendSpawnIdleIOBackground=true

# Set whether the spawned backends are allowed to be SIGKILLed if they do not
# respond to SIGQUIT. This ensures that Cancel() works as expected, but
# somtimes can corrupt databases if they are open.
#
# Only change this to FALSE if your backend can not be SIGKILLed without
# database corruption.
#
# Even if this is set TRUE, the backend can still enforce this FALSE if it it
# explicitly set in the compiled backend. You can think of this as a fallback
# value that is used when backends do not enforce policy, or as a way to disable
# SIGKILL even for backends that calim to support it.
#
# default=true
BackendSpawnAllowSIGKILL=true

# 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.
#
# default=aptcc
DefaultBackend=aptcc

# Use syslog to audit and log actions where available.
#
# default=false
UseSyslog=false

# Proxy settings, uncomment as required
#
# NOTE: PackageKit does not use these settings, they are passed to backends.
# Backends may ignore these values. If either of ProxyHTTP or ProxyFTP
# are set then the users proxy settings are ignored.
#
# They are in the format username:password@server:port
#
# ProxyHTTP=username:password@server.lan:8080
# ProxyHTTPS=username:password@server.lan:8080
# ProxyFTP=server.lan:21
# ProxySOCKS=server.lan:21
# NoProxy=internal.webserver
# PAC=/etc/proxy.pac

# Scan installed desktop files when we update or install packages
#
# NOTE: Don't enable this for backends that are slow doing SearchFile()
#
# default=true
ScanDesktopFiles=true

# Update the package list when we refresh the cache
#
# NOTE: Don't enable this for backends that are slow doing GetPackages()
#
# default=true
UpdatePackageList=true

# Check for running processes when we update packages
#
# NOTE: Don't enable this for backends that are slow doing GetFiles() on
# installed files.
#
# default=true
UpdateCheckProcesses=true

# Check for shared libraries that are in use, that are replaced by packages
# that are marked as security updates.
#
# NOTE: Don't enable this for backends that are slow doing GetFiles() on
# installed files.
#
# default=true
CheckSharedLibrariesInUse=true

# Check for updates in testing repositories when we check for updates
#
# NOTE: Don't enable this if you do not want testing updates to be checked
# as this will increase the network bandwidth used.
#
# default=true
CheckTestingRepos=true

# Use update cache when possible to avoid using the backend
#
# NOTE: Enabling this reduces calls to the backend, although using the
# SetHints(cache-age) parameter will return unpredicable results for
# transactions.
#
# default=false
UseUpdateCache=false

# Use strict developer checking in the daemon
#
# This should be set to TRUE if the backend should be run in strict compliance
# mode, which is useful when developing a backend. Normal sane users should not
# have to use this mode.
#
# If this is set to FALSE, then the daemon will try to 'fix' any craziness in
# the backend without notifying the end user.
#
# default=false
DeveloperMode=false

# The time in seconds to wait when we get the StateHasChanged method
#
# This should be used when a native tool has been used, and the update UIs
# should be updated to reflect reality.
#
# default=30
StateChangedTimeoutPriority=30

# The time in seconds to wait after the computer has been resumed or any non
# package related system event
#
# We don't want to be doing an update check at the busy time after a resume
#
# default=600
StateChangedTimeoutNormal=600

# The maximum number of requests a given user is able to request and queue
#
# Setting this lower decreases the risk of a local denial of service, but may
# cause errors if the desktop client is doing many requests to the daemon in a
# short period of time.
#
# default=500
SimultaneousTransactionsForUid=500

# The maximum number of items that can be resolved in one method
#
# Setting this lower decreases the risk of a local denial of service, but may
# cause errors if the desktop client is trying to resolve a large number of
# packages in one method.
#
# default=100
MaximumItemsToResolve=3200

# The maximum number of packages that can be processed in one method
#
# Setting this lower decreases the risk of a local denial of service, but may
# cause errors if the desktop client is trying to do a large transaction.
#
# default=2500
MaximumPackagesToProcess=4000

# How long the transaction is valid before it's destroyed, in seconds
#
# The client only has a finite amount of time to use the object, else it is
# destroyed. Setting this longer will allow malicious clients to queue up large
# number of authentication requests, but setting this shorter will reduce the
# amount of time the user has to authenticate.
#
# default=300
TransactionCreateCommitTimeout=300

# How long the transaction should be queriable after it is finished, in seconds
#
# Give the client a few seconds to still query the transaction after it has
# finished by keeping it on the bus. Setting this larger allows clients to query
# the transaction without accessing the database, but increases memory usage.
#
# default=5
TransactionKeepFinishedTimeout=5

# If certain operations should be done using IDLE bandwidth
#
# TCP Low Priority is a congestion control algorithm included in the kernel.
# Connections using this algorithm will use only idle bandwidth. In other words,
# it is a self-tuning TCP stack. Setting this to FALSE will mean that the check
# for updates happens more quickly, at the expense of other network applications
# such as firefox and other file downloaders.
#
# If the user is running the network at 100% for extended periods of time, then
# the update check may be starved and take a very long time to complete. In this
# rare case, this setting should be set to FALSE.
#
# By also setting this setting to TRUE makes the possibility of a environment
# mismatch much higher for a spawned backend. This will make switching from idle
# operations (such as GetUpdates) and full speed operations (such as
# InstallPackages) take longer. If this is a concern, then set this to FALSE.
#
# default=true
UseIdleBandwidth=true

# Processes that cannot be updated when they are running
#
# Some processes do not cope well when they are upgraded when the binary is
# running. These include things like firefox, where updating causes the original
# instance to misbehave as some components are not locked in memory.
#
# Applications can be added here that do not cope well with being updated.
#
# NOTE: you should not list applications here that the user has no permission
# or cannot shutdown without the session exploding. For instance, listing
# /sbin/dbus-daemon or /usr/sbin/haldaemon would be a really bad idea.
#
# Seporate entries can be seporated with the ';' character.
#
# default=/usr/lib*/*/firefox
NoUpdateProcessList=/usr/lib/*/firefox;/usr/lib/*/iceweasel

# If the backend should use threads to avoid blocking the daemon for other users
#
# The daemon, packagekitd, is shared by multiple users. Users are allowed to
# create and send transactions when other transactions are being processed.
# To do this, the backend action is created in a thread, but some libraries
# notably libdbus and dbus-glib, are less threadsafe then they probably should
# be.
#
# Only developers need to change this value, normally for debugging purposes.
#
# default=true
UseThreadsInBackend=true

# If a custom root should be used when installing packages
#
# A custom route can be used to install to a LTSP instance or a virtual machine
# image, typically using chroot or by mounting an image using virt-inspector.
#
# Additional authentication is required to change the root from the default.
#
# Most users do not need to change this value, as you need to have setup a
# native package database (e.g. the rpmdb) on the new root.
#
# default=/
UseRoot=/

# If background tasks should be cancelled if a foreground one is committed
#
# This allows us to have session agents automatically using PackageKit,
# and for any in-flight requests to be cancelled and automatically
# requeued if a high-priority transaction is added.
#
# This avoids the user waiting for actions such as installing software
# or when getting lists of uninstalled software for BASH when programs
# like gnome-settings-daemon are checking for updates or refreshing the
# cache in the background.
#
# Set this value to be false if transactions cannot be safely or sanely
# cancelled.
#
# default=true
CancelBackgroundTransactions=true