How to fix an error: password authentication failed for the user in PostgreSQL

I have two solutions for this Error.

First solution :

open Terminal and write this command in the terminal

sudo editor /etc/postgresql/<postgresql version >/main/pg_hba.conf

• you can click Tab , if you didn’t know PostgreSQL version

Then, go to the bottom of the file you just played and edit these lines
- if scroll didn’t work you can use keyboard buttons to scroll down

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5

• you must change peer and md5 to trust to be as this

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                 trust
# IPv4 local connections:
host    all             all             127.0.0.1/32…