First of all, I upgraded from 18.7, not 18.2, I typoed earlier.
After some digging, the problem I originally reported turns out to be a warning that can safely be ignored. In case anybody else comes across this, here's what's going on.
This sql statement is invoked in line 107 of the script /usr/lib/bareos/scripts/update_bareos_tables. The only command after this is to remove files in /tmp. Digging into the database and inspecting the sequence basefiles_baseid_seq shows that it is already of type BIGINT, which triggered the warning.
bareos=# \d basefiles_baseid_seq
Sequence "public.basefiles_baseid_seq"
Column | Type | Value
---------------+---------+----------------------
sequence_name | name | basefiles_baseid_seq
last_value | bigint | 1
start_value | bigint | 1
increment_by | bigint | 1
max_value | bigint | 9223372036854775807
min_value | bigint | 1
cache_value | bigint | 1
log_cnt | bigint | 0
is_cycled | boolean | f
is_called | boolean | f
Owned by: public.basefiles.baseid
Since it was only a warning, pgsql did not return an error, and the rest of the script completed successfully. Restarted the director daemon and it comes up fine, listing all of my completed jobs, which should indicate a happy database.
Upgrading all my clients went fine without any problems.
Seth