Preliminary Remark: When you have migrated your database from an earlier version, the ID of your admin user may be different than suggested below. In this case you should check the ID of your admin user directly in the res_users table in your database.

Odoo 8.0:

Change the password directly in the Postgres Database, as it is saved in plain text:

~$  sudo su postgres
~$  psql
postgres=# \connect Your_Database_Name
You are now connected to database "Your_database_Name" as user "postgres"
YOurDatabase_Name=# update res_users set password='YourNewPassword' where id='1';

Odoo 9.0 and Odoo 10.0:

Create a hash and then change the hash in the Postgres database:

~$ python
>>> from passlib.context import CryptContext
>>> print CryptContext(['pbkdf2_sha512']).encrypt('YourNewPassword')
Copy the Hash created
Ctrl D
~$  sudo su postgres
~$  psql
postgres=# \connect Your_Database_Name
You are now connected to database "Your_database_Name" as user "postgres"
YOurDatabase_Name=# UPDATE res_users SET password='', password_crypt='YourCopiedHash' WHERE id=1;
YOurDatabase_Name=# \q

Odoo 11:

Create a hash using Python 3 and change the hash in the Postgres database:

~$ python3
>>> from passlib.context import CryptContext
>>> setpw = CryptContext(schemes=['pbkdf2_sha512'])
>>> setpw.encrypt('YourNewPassword')
Copy the Hash created
Ctrl D
~$  sudo su postgres
~$  psql
postgres=# \connect Your_Database_Name
You are now connected to database "Your_database_Name" as user "postgres"
YOurDatabase_Name=# UPDATE res_users SET password='', password_crypt='YourCopiedHash' WHERE id=1;
YOurDatabase_Name=# \q

Odoo 12 and Odoo 13:

Create a hash using Python 3 and change the hash in the Postgres database:

~$ python3
>>> from passlib.context import CryptContext
>>> setpw = CryptContext(schemes=['pbkdf2_sha512'])
>>> setpw.encrypt('YourNewPassword')
Copy the Hash created
Ctrl D
~$  sudo su postgres
~$  psql
postgres=# \connect Your_Database_Name
You are now connected to database "Your_database_Name" as user "postgres"
YOurDatabase_Name=# UPDATE res_users SET password='YourCopiedHash' WHERE id=2;
YOurDatabase_Name=# \q

Please be aware that since Odoo12 the Primary Key of the admin user has changed. The new ID is 2 (not 1 as in earlier versions) in a new install, if you have migrated your database from an earlier version, it might be even a higher number - please check your res_users table in the database first in this case.

Also there is no separate field "password_crypt" anymore.

Enjoy your saved life and don't forget to upvote this little tutorial!

If you want reset password to 1 

sudo -u postgres psql

\connect YOUR_DATABASE

UPDATE res_users SET password='$pbkdf2-sha512$25000$4xwjZEwJgbCWsvaec875nw$eKhXFLBpAWHixi3QaE4/UHVfDLKEFLV5ZG4HFWP2FfctTAi6Jx4pahTQWgnVbqO3yXl9AQgdM8gHksNrbrh8Jg' WHERE id=2;

In my case i made all the steps from Ermin, but still not working, to solve the problem i have to reset to null some fields in res_users table in the postgres database. sale_team_id and website_id have to be in null in order to gain access and login. And also be aware than the partner_id point directly to the correct res_partner table field id.

Worked like a cham. 

Thanks a lot for the post

A lot of thanks for you post.

I'm using Odoo 11 and work perfectly.

I can't upvote for ¢#@$&$@ karma system.

Best regards

hi, thank you. How different are Odoo 9-10 and Odoo 11 ? Why do you specify two different syntaxes ?

Edit after your comments:

It seems to me the syntax may depend on python2 vs python3, independently from Odoo version.

I run Odoo 11 on python3 of course, but my script which changes the password uses python2 according to first syntax and no bug was reported up to now.

Here is the best and shortcut way to get the password:

in the terminal:

type: 

1.sudo su postgres

2.psql 

you get like this:postgres=#

3. \connect your_db_name

you get this message:

You are now connected to database "your_db_name" as user "postgres".

4. type UPDATE res_users SET password='new_password' WHERE login = 'your_email';

Now you are set and good to go.

If you don't know your_email login, do the follwinng:

in step 4, just write the following:

your_db_name=# select id, login from res_users;

and you get:

id             login

----------------

1              publice

2              etc