Error when upgrading from 5.0 to 6.8

When upgrading from 5.6 to 6.8 I get the following traceback:

Traceback (most recent call last):
  File "/home/pokoli/projectes/softronica/clean_deprecated_modules.py", line 182, in <module>
    migrate(args.database, args.config_file)
  File "/home/pokoli/projectes/softronica/clean_deprecated_modules.py", line 169, in migrate
    run(options)
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/admin.py", line 57, in run
    pool.init(update=options.update, lang=list(lang),
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/pool.py", line 167, in init
    restart = not load_modules(
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/modules/__init__.py", line 451, in load_modules
    _load_modules(update)
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/modules/__init__.py", line 419, in _load_modules
    load_module_graph(graph, pool, update, lang)
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/modules/__init__.py", line 239, in load_module_graph
    cls.__register__(module)
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/modules/country/country.py", line 519, in __register__
    table_h = cls.__table_handler__(module)
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/model/modelsql.py", line 353, in __table_handler__
    return backend.TableHandler(cls, history=history)
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/backend/table.py", line 23, in __new__
    instance._init(model, history=history)
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/backend/postgresql/table.py", line 102, in _init
    migrate_to_identity(self.table_name, 'id')
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/backend/postgresql/table.py", line 51, in migrate_to_identity
    cursor.execute(
  File "/home/pokoli/.virtualenvs/softronica/lib/python3.10/site-packages/trytond/backend/postgresql/database.py", line 68, in execute
    cursor.execute(self, sql, args)
psycopg2.errors.UndefinedTable: relation "country_postal_code_id_seq" does not exist