<s>
The	O
Software	B-Protocol
Upgrade	I-Protocol
Protocol	I-Protocol
(	O
or	O
SUP	O
)	O
System	O
is	O
a	O
set	O
of	O
programs	O
developed	O
by	O
Carnegie	O
Mellon	O
University	O
in	O
the	O
1980s	O
(	O
as	O
was	O
the	O
Andrew	B-Application
File	I-Application
System	I-Application
)	O
.	O
</s>
<s>
It	O
was	O
originally	O
developed	O
under	O
the	O
Mach	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
but	O
implementations	O
are	O
provided	O
with	O
Debian	O
&	O
Ubuntu	O
Linux	O
distributions	O
.	O
</s>
