/usr/share/postgresql-common/t/9.1.conf is in postgresql-common 173ubuntu0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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listen_addresses = 'localhost'
port = 5432
max_connections = 100
superuser_reserved_connections = 3
unix_socket_directory = ''
unix_socket_group = ''
unix_socket_permissions = 0777
bonjour = off
bonjour_name = ''
authentication_timeout = 1min
ssl = off
ssl_ciphers = 'ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH'
ssl_renegotiation_limit = 512MB
password_encryption = on
db_user_namespace = off
krb_server_keyfile = ''
krb_srvname = 'postgres'
krb_caseins_users = off
tcp_keepalives_idle = 0
tcp_keepalives_interval = 0
tcp_keepalives_count = 0
shared_buffers = 24MB
temp_buffers = 8MB
max_prepared_transactions = 0
work_mem = 1MB
maintenance_work_mem = 16MB
max_stack_depth = 2MB
max_files_per_process = 1000
shared_preload_libraries = ''
vacuum_cost_delay = 0ms
vacuum_cost_page_hit = 1
vacuum_cost_page_miss = 10
vacuum_cost_page_dirty = 20
vacuum_cost_limit = 200
bgwriter_delay = 200ms
bgwriter_lru_maxpages = 100
bgwriter_lru_multiplier = 2.0
effective_io_concurrency = 1
wal_level = minimal
fsync = on
synchronous_commit = on
wal_sync_method = fsync
full_page_writes = on
wal_buffers = -1
wal_writer_delay = 200ms
commit_delay = 0
commit_siblings = 5
checkpoint_segments = 3
checkpoint_timeout = 5min
checkpoint_completion_target = 0.5
checkpoint_warning = 30s
archive_mode = off
archive_command = ''
archive_timeout = 0
max_wal_senders = 0
wal_sender_delay = 1s
wal_keep_segments = 0
vacuum_defer_cleanup_age = 0
replication_timeout = 60s
synchronous_standby_names = ''
hot_standby = off
max_standby_archive_delay = 30s
max_standby_streaming_delay = 30s
wal_receiver_status_interval = 10s
hot_standby_feedback = off
enable_bitmapscan = on
enable_hashagg = on
enable_hashjoin = on
enable_indexscan = on
enable_material = on
enable_mergejoin = on
enable_nestloop = on
enable_seqscan = on
enable_sort = on
enable_tidscan = on
seq_page_cost = 1.0
random_page_cost = 4.0
cpu_tuple_cost = 0.01
cpu_index_tuple_cost = 0.005
cpu_operator_cost = 0.0025
effective_cache_size = 128MB
geqo = on
geqo_threshold = 12
geqo_effort = 5
geqo_pool_size = 0
geqo_generations = 0
geqo_selection_bias = 2.0
geqo_seed = 0.0
default_statistics_target = 100
constraint_exclusion = partition
cursor_tuple_fraction = 0.1
from_collapse_limit = 8
join_collapse_limit = 8
log_destination = 'stderr'
logging_collector = off
log_directory = 'pg_log'
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
log_file_mode = 0600
log_truncate_on_rotation = off
log_rotation_age = 1d
log_rotation_size = 10MB
syslog_facility = 'LOCAL0'
syslog_ident = 'postgres'
silent_mode = off
client_min_messages = notice
log_min_messages = warning
log_min_error_statement = error
log_min_duration_statement = -1
debug_print_parse = off
debug_print_rewritten = off
debug_print_plan = off
debug_pretty_print = on
log_checkpoints = off
log_connections = off
log_disconnections = off
log_duration = off
log_error_verbosity = default
log_hostname = off
log_line_prefix = ''
log_lock_waits = off
log_statement = 'none'
log_temp_files = -1
log_timezone = 'Europe/Berlin'
track_activities = on
track_counts = on
track_functions = none
track_activity_query_size = 1024
update_process_title = on
stats_temp_directory = '/var/run/postgresql/9.1-main.pg_stat_tmp'
log_parser_stats = off
log_planner_stats = off
log_executor_stats = off
log_statement_stats = off
autovacuum = on
log_autovacuum_min_duration = -1
autovacuum_max_workers = 3
autovacuum_naptime = 1min
autovacuum_vacuum_threshold = 50
autovacuum_analyze_threshold = 50
autovacuum_vacuum_scale_factor = 0.2
autovacuum_analyze_scale_factor = 0.1
autovacuum_freeze_max_age = 200000000
autovacuum_vacuum_cost_delay = 20ms
autovacuum_vacuum_cost_limit = -1
search_path = '"$user",public'
default_tablespace = ''
temp_tablespaces = ''
check_function_bodies = on
default_transaction_isolation = 'read committed'
default_transaction_read_only = off
default_transaction_deferrable = off
session_replication_role = 'origin'
statement_timeout = 0
vacuum_freeze_min_age = 50000000
vacuum_freeze_table_age = 150000000
bytea_output = 'hex'
xmlbinary = 'base64'
xmloption = 'content'
datestyle = 'iso, mdy'
intervalstyle = 'postgres'
timezone = 'Europe/Berlin'
timezone_abbreviations = 'Default'
extra_float_digits = 0
client_encoding = sql_ascii
lc_messages = 'C'
lc_monetary = 'C'
lc_numeric = 'C'
lc_time = 'C'
default_text_search_config = 'pg_catalog.simple'
dynamic_library_path = '$libdir'
local_preload_libraries = ''
deadlock_timeout = 1s
max_locks_per_transaction = 64
max_pred_locks_per_transaction = 64
array_nulls = on
backslash_quote = safe_encoding
default_with_oids = off
escape_string_warning = on
lo_compat_privileges = off
quote_all_identifiers = off
sql_inheritance = on
standard_conforming_strings = on
synchronize_seqscans = on
transform_null_equals = off
exit_on_error = off
restart_after_crash = on
custom_variable_classes = ''
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