/etc/PackageKit/PackageKit.conf is in packagekit 0.8.17-4ubuntu6~gcc5.4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# should not have to change anything.
[Daemon]
# 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
# 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
# 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 cache on PackageKit transactions
# The cache is used by client applications to fetch
# package-information very fast.
#
# NOTE: Don't enable this for backends that are slow doing GetPackages()
# or GetDetails()
#
# default=false
UpdatePackageCache=false
# Update the package list on PackageKit transactions
#
# NOTE: Don't enable this for backends that are slow doing GetPackages()
#
# default=true
UpdatePackageList=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=2
StateChangedTimeoutPriority=2
# 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=4800
MaximumItemsToResolve=4800
# 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=5200
MaximumPackagesToProcess=5200
# 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
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