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/usr/share/dpkg/ostable is in dpkg 1.19.0.5ubuntu2.

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The actual contents of the file can be viewed below.

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# Version=2.0
#
# This file contains the table of known operating system names.
#
# Architecture names are formed as a combination of the system name
# (from this table) and CPU name (from cputable) after mapping from
# the Debian arch tuple (from tupletable).
#
# - Column 1 is the Debian name for the system, used to form the system part
#   in the Debian arch tuple.
# - Column 2 is the GNU name for the system, used to output build, host and
#   target variables in ‘dpkg-architecture’.
# - Column 3 is an extended regular expression used to match against the
#   system part of the output of the GNU config.guess script.
#
# <Debian name>		<GNU name>		<config.guess regex>
eabi-uclibc-linux	linux-uclibceabi	linux[^-]*-uclibceabi
base-uclibc-linux	linux-uclibc		linux[^-]*-uclibc
eabihf-musl-linux	linux-musleabihf	linux[^-]*-musleabihf
base-musl-linux		linux-musl		linux[^-]*-musl
eabihf-gnu-linux	linux-gnueabihf		linux[^-]*-gnueabihf
eabi-gnu-linux		linux-gnueabi		linux[^-]*-gnueabi
abin32-gnu-linux	linux-gnuabin32		linux[^-]*-gnuabin32
abi64-gnu-linux		linux-gnuabi64		linux[^-]*-gnuabi64
spe-gnu-linux		linux-gnuspe		linux[^-]*-gnuspe
x32-gnu-linux		linux-gnux32		linux[^-]*-gnux32
ilp32-gnu-linux		linux-gnu_ilp32		linux[^-]*-gnu_ilp32
base-gnu-linux		linux-gnu		linux[^-]*(-gnu.*)?
eabihf-gnu-kfreebsd	kfreebsd-gnueabihf	kfreebsd[^-]*-gnueabihf
base-gnu-kfreebsd	kfreebsd-gnu		kfreebsd[^-]*(-gnu.*)?
base-gnu-knetbsd	knetbsd-gnu		knetbsd[^-]*(-gnu.*)?
base-gnu-kopensolaris	kopensolaris-gnu	kopensolaris[^-]*(-gnu.*)?
base-gnu-hurd		gnu			gnu[^-]*
base-bsd-darwin		darwin			darwin[^-]*
base-bsd-dragonflybsd	dragonflybsd		dragonfly[^-]*
base-bsd-freebsd	freebsd			freebsd[^-]*
base-bsd-netbsd		netbsd			netbsd[^-]*
base-bsd-openbsd	openbsd			openbsd[^-]*
base-sysv-aix		aix			aix[^-]*
base-sysv-solaris	solaris			solaris[^-]*
eabi-uclibc-uclinux	uclinux-uclibceabi	uclinux[^-]*-uclibceabi
base-uclibc-uclinux	uclinux-uclibc		uclinux[^-]*(-uclibc.*)?
base-tos-mint		mint			mint[^-]*