<s>
PackageKit	B-Language
is	O
a	O
free	B-License
and	I-License
open-source	I-License
suite	O
of	O
software	B-Application
applications	I-Application
designed	O
to	O
provide	O
a	O
consistent	O
and	O
high-level	O
front	B-Architecture
end	I-Architecture
for	O
a	O
number	O
of	O
different	O
package	B-Application
management	I-Application
systems	I-Application
.	O
</s>
<s>
PackageKit	B-Language
was	O
created	O
by	O
Richard	O
Hughes	O
in	O
2007	O
,	O
and	O
first	O
introduced	O
into	O
an	O
operating	B-General_Concept
system	I-General_Concept
as	O
a	O
default	O
application	O
in	O
May	O
2008	O
with	O
the	O
release	O
of	O
Fedora	O
9	O
.	O
</s>
<s>
The	O
suite	O
is	O
cross-platform	B-Operating_System
,	O
though	O
it	O
is	O
primarily	O
targeted	O
at	O
Linux	B-Application
distributions	I-Application
which	O
follow	O
the	O
interoperability	O
standards	O
set	O
out	O
by	O
the	O
freedesktop.org	B-Application
group	O
.	O
</s>
<s>
It	O
uses	O
the	O
software	B-Library
libraries	I-Library
provided	O
by	O
the	O
D-Bus	B-Language
and	O
Polkit	B-Language
projects	O
to	O
handle	O
inter-process	O
communication	O
and	O
privilege	O
negotiation	O
respectively	O
.	O
</s>
<s>
PackageKit	B-Language
seeks	O
to	O
introduce	O
automatic	O
updates	O
without	O
having	O
to	O
authenticate	O
as	O
root	O
,	O
fast-user-switching	O
,	O
warnings	O
translated	O
into	O
the	O
correct	O
locale	O
,	O
common	O
upstream	O
GNOME	O
and	O
KDE	O
tools	O
and	O
one	O
software	O
over	O
multiple	O
Linux	B-Application
distributions	I-Application
.	O
</s>
<s>
Although	O
bug	O
fixes	O
are	O
still	O
released	O
,	O
no	O
major	O
features	O
have	O
been	O
developed	O
since	O
around	O
2014	O
,	O
and	O
the	O
package	O
's	O
maintainer	O
predicts	O
that	O
it	O
will	O
gradually	O
be	O
replaced	O
by	O
other	O
tools	O
as	O
technologies	O
such	O
as	O
Flatpak	B-Language
and	O
Snap	B-Application
become	O
more	O
popular	O
.	O
</s>
<s>
PackageKit	B-Language
runs	O
as	O
a	O
system-activated	O
daemon	B-Operating_System
,	O
named	O
packagekitd	B-Language
,	O
which	O
abstracts	O
out	O
differences	O
between	O
the	O
different	O
systems	O
.	O
</s>
<s>
A	O
library	O
called	O
libpackagekit	O
allows	O
other	O
programs	O
to	O
interact	O
with	O
PackageKit	B-Language
.	O
</s>
<s>
pkcon	O
is	O
the	O
official	O
front-end	B-Architecture
of	O
PackageKit	B-Language
,	O
it	O
operates	O
from	O
the	O
command-line	B-Application
.	O
</s>
<s>
GTK-based	O
:	O
</s>
<s>
gnome-packagekit	O
is	O
an	O
official	O
GNOME	O
front-end	B-Architecture
for	O
PackageKit	B-Language
.	O
</s>
<s>
Unlike	O
GNOME	B-Language
Software	I-Language
,	O
gnome-packagekit	O
can	O
handle	O
all	O
packages	O
,	O
not	O
just	O
applications	O
,	O
and	O
has	O
advanced	O
features	O
that	O
are	O
missing	O
in	O
GNOME	B-Language
Software	I-Language
as	O
of	O
June	O
2020	O
.	O
</s>
<s>
GNOME	B-Language
Software	I-Language
is	O
a	O
utility	O
for	O
installing	O
the	O
applications	O
and	O
updates	O
on	O
Linux	B-Application
.	O
</s>
<s>
It	O
is	O
part	O
of	O
the	O
GNOME	B-Language
Core	I-Language
Applications	I-Language
and	O
was	O
introduced	O
in	O
GNOME	O
3.10	O
.	O
</s>
<s>
Qt-based	O
:	O
</s>
<s>
A	O
number	O
of	O
different	O
package	B-Application
management	I-Application
systems	I-Application
(	O
known	O
as	O
back-ends	B-Architecture
)	O
support	O
different	O
abstract	O
methods	O
and	O
signals	O
used	O
by	O
the	O
front-end	B-Architecture
tools	O
.	O
</s>
<s>
Supported	O
back-ends	B-Architecture
include	O
:	O
</s>
