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/usr/share/postgresql/10/timezonesets/Australia is in postgresql-10 10.6-0ubuntu0.18.04.1.

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The actual contents of the file can be viewed below.

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# Time zone configuration file for set "Australia"

# The abbreviations set up by this file are no longer in widespread use,
# and should be avoided when possible.  Use this file if you need backwards
# compatibility with old applications or data.

# In order to use this file, you need to set the run-time parameter
# timezone_abbreviations to 'Australia'.  See the `Date/Time Support'
#   appendix in the PostgreSQL documentation for more information.
#
# src/timezone/tznames/Australia


# include the default set
@INCLUDE Default

# most timezones are already defined in the default set. With the OVERRIDE
# option, PostgreSQL will use the new definitions instead of throwing an error
# in case of a conflict.
@OVERRIDE

CST     34200    # Central Standard Time (not in IANA database)
EAST    36000    # East Australian Standard Time (not in IANA database)
EST     36000    # Eastern Standard Time (not in IANA database)
SAST    34200    # South Australian Standard Time (not in IANA database)
SAT     34200    # South Australian Standard Time (not in IANA database)
WST     28800    # Western Standard Time (not in IANA database)