<s>
Ubuntu	B-Language
One	I-Language
is	O
an	O
OpenID-based	O
single	O
sign-on	O
service	O
operated	O
by	O
Canonical	O
Ltd	O
.	O
to	O
allow	O
users	O
to	O
log	O
onto	O
many	O
Canonical-owned	O
Web	O
sites	O
.	O
</s>
<s>
Until	O
April	O
2014	O
,	O
Ubuntu	B-Language
One	I-Language
was	O
also	O
a	O
file	B-Application
hosting	I-Application
service	I-Application
and	O
music	O
store	O
that	O
allowed	O
users	O
to	O
store	O
data	O
"	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
"	O
.	O
</s>
<s>
Ubuntu	B-Language
One	I-Language
had	O
a	O
client	O
application	O
that	O
ran	O
on	O
Ubuntu	B-Operating_System
9.04	O
and	O
later	O
,	O
Windows	B-Application
XP	I-Application
or	O
newer	O
,	O
and	O
Mac	B-Device
OS	I-Device
X	I-Device
10.6	I-Device
and	O
higher	O
.	O
</s>
<s>
Other	O
Linux	B-Application
distributions	O
not	O
running	O
GNOME	B-Application
were	O
supported	O
through	O
a	O
console	O
client	O
.	O
</s>
<s>
The	O
source	O
code	O
is	O
available	O
through	O
launchpad	B-Protocol
and	O
can	O
easily	O
be	O
compiled	O
for	O
other	O
Unix-like	O
operating	O
systems	O
,	O
such	O
as	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
There	O
was	O
an	O
Ubuntu	B-Language
One	I-Language
music	O
app	O
for	O
iOS	B-Application
devices	O
.	O
</s>
<s>
A	O
free	O
Ubuntu	B-Language
One	I-Language
account	O
offered	O
5	O
GB	O
of	O
storage	O
.	O
</s>
<s>
The	O
Ubuntu	B-Language
One	I-Language
service	O
was	O
similar	O
to	O
Microsoft	B-Application
OneDrive	I-Application
,	O
iCloud	B-Application
,	O
Dropbox	B-Application
,	O
Google	B-Application
Play	I-Application
Music	I-Application
,	O
Amazon	B-Application
Cloud	I-Application
Player	I-Application
.	O
</s>
<s>
Its	O
client	O
code	O
was	O
written	O
in	O
Python	B-Language
.	O
</s>
<s>
It	O
used	O
Twisted	B-Language
for	O
its	O
low-level	O
networking	O
and	O
Protocol	B-Protocol
Buffers	I-Protocol
for	O
protocol	O
description	O
.	O
</s>
<s>
Data	O
was	O
synced	O
over	O
a	O
custom	O
protocol	O
called	O
"	O
storage	O
"	O
,	O
and	O
stored	O
on	O
Amazon	B-General_Concept
S3	I-General_Concept
.	O
</s>
<s>
Ubuntu	B-Language
One	I-Language
offered	O
automatic	O
upload	O
of	O
photos	O
taken	O
from	O
Android	B-Application
mobile	I-Application
devices	O
for	O
immediate	O
synchronization	O
across	O
computers	O
;	O
integration	O
with	O
Mozilla	B-Application
Thunderbird	I-Application
for	O
contacts	O
and	O
with	O
Tomboy	B-Language
for	O
notes	O
due	O
to	O
the	O
access	O
to	O
the	O
local	O
CouchDB	B-Application
instance	O
.	O
</s>
<s>
It	O
also	O
had	O
capabilities	O
for	O
purchasing	O
DRM-free	O
music	O
while	O
synchronizing	O
them	O
automatically	O
with	O
an	O
Ubuntu	B-Language
One	I-Language
Account	O
via	O
the	O
Ubuntu	B-Language
One	I-Language
Music	I-Language
Store	I-Language
(	O
in	O
partnership	O
with	O
7digital	B-Application
)	O
.	O
</s>
<s>
Ubuntu	B-Language
One	I-Language
published	O
APIs	B-Application
for	O
developers	O
wishing	O
to	O
build	O
applications	O
with	O
file	O
and	O
data	O
synchronization	O
or	O
music	O
streaming	O
.	O
</s>
<s>
An	O
Ubuntu	B-Language
One	I-Language
account	O
gave	O
users	O
access	O
to	O
the	O
Canonical	O
Store	O
,	O
Launchpad	B-Protocol
,	O
Ubuntu	B-Language
One	I-Language
and	O
other	O
Ubuntu	B-Operating_System
services	O
;	O
an	O
Ubuntu	B-Language
One	I-Language
account	O
allowed	O
users	O
to	O
store	O
files	O
within	O
the	O
cloud	O
,	O
store	O
their	O
contacts	O
details	O
within	O
the	O
interface	O
,	O
access	O
the	O
Ubuntu	B-Language
One	I-Language
Music	I-Language
Store	I-Language
to	O
buy	O
music	O
from	O
and	O
activate	O
the	O
Ubuntu	B-Language
Software	I-Language
Center	I-Language
.	O
</s>
<s>
Other	O
sites	O
that	O
support	O
OpenID	O
authorization	O
also	O
had	O
support	O
for	O
Ubuntu	B-Language
One	I-Language
.	O
</s>
<s>
In	O
June	O
2013	O
,	O
the	O
Ubuntu	B-General_Concept
Single	I-General_Concept
Sign	I-General_Concept
On	I-General_Concept
account	O
was	O
re-branded	O
under	O
Ubuntu	B-Language
One	I-Language
as	O
part	O
of	O
consolidating	O
Canonical	O
's	O
online	O
services	O
under	O
the	O
Ubuntu	B-Language
One	I-Language
brand	O
.	O
</s>
<s>
Also	O
,	O
the	O
announcement	O
identified	O
Ubuntu	B-Operating_System
Pay	O
as	O
another	O
service	O
to	O
come	O
under	O
the	O
brand	O
.	O
</s>
<s>
Following	O
a	O
security	O
breach	O
in	O
July	O
2013	O
,	O
Canonical	O
put	O
the	O
Ubuntu	B-Operating_System
Forums	O
under	O
the	O
brand	O
,	O
meaning	O
that	O
Forum	O
users	O
now	O
log	O
in	O
using	O
Ubuntu	B-Language
One	I-Language
,	O
rather	O
than	O
with	O
the	O
previous	O
username-password	O
system	O
.	O
</s>
<s>
On	O
April	O
2	O
,	O
2014	O
,	O
Canonical	O
announced	O
shutting	O
down	O
of	O
select	O
Ubuntu	B-Language
One	I-Language
services	O
.	O
</s>
<s>
Canonical	O
explained	O
that	O
they	O
were	O
not	O
willing	O
to	O
make	O
more	O
investment	O
in	O
Ubuntu	B-Language
One	I-Language
,	O
which	O
would	O
be	O
required	O
to	O
compete	O
with	O
other	O
services	O
.	O
</s>
<s>
The	O
company	O
also	O
announced	O
plans	O
to	O
release	O
the	O
source	O
code	O
for	O
the	O
Ubuntu	B-Language
One	I-Language
server	O
software	O
to	O
the	O
public	O
under	O
an	O
open-source	O
license	O
.	O
</s>
<s>
The	O
shutdown	O
of	O
cloud	O
storage	O
and	O
synchronization	O
services	O
does	O
not	O
affect	O
the	O
single	O
sign-on	O
function	O
of	O
Ubuntu	B-Language
One	I-Language
,	O
which	O
will	O
remain	O
in	O
place	O
.	O
</s>
<s>
Ubuntu	B-Language
One	I-Language
has	O
been	O
criticized	O
within	O
the	O
Ubuntu	B-Operating_System
community	O
for	O
using	O
proprietary	B-Application
server	O
software	O
.	O
</s>
<s>
There	O
was	O
no	O
native	O
client	O
integration	O
for	O
the	O
Kubuntu	B-Application
variant	O
of	O
the	O
Ubuntu	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
as	O
of	O
January	O
2013	O
.	O
</s>
<s>
Kubuntu	B-Application
integration	O
was	O
under	O
development	O
and	O
had	O
also	O
received	O
a	O
grant	O
from	O
the	O
Google	B-Application
Summer	I-Application
of	I-Application
Code	I-Application
2010	O
.	O
</s>
<s>
The	O
Amarok	B-Language
development	O
team	O
announced	O
that	O
they	O
would	O
not	O
add	O
support	O
for	O
the	O
Ubuntu	B-Language
One	I-Language
Music	I-Language
Store	I-Language
to	O
the	O
Amarok	B-Language
media	O
player	O
for	O
the	O
moment	O
,	O
unlike	O
the	O
Magnatune	O
media	O
store	O
,	O
which	O
returns	O
10%	O
of	O
the	O
revenue	O
produced	O
via	O
the	O
interface	O
to	O
Amarok	B-Language
.	O
</s>
<s>
Storage	O
was	O
out-sourced	O
to	O
Amazon	B-General_Concept
S3	I-General_Concept
.	O
</s>
<s>
Files	O
stored	O
in	O
the	O
Ubuntu	B-Language
One	I-Language
file	O
stores	O
were	O
not	O
encrypted	O
.	O
</s>
