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如何安装，创建postqresql db并连接到ubuntu中的项目
我做不到...…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

sudo -u postgres psql
[sudo] password for narjes: 
could not change directory to "/home/narjes/Documents/my_city/my_city": Permission denied
psql (14.9 (Ubuntu 14.9-0ubuntu0.22.04.1))
Type "help" for help.

postgres=# createuser narjes
postgres-# createdb dbsh
postgres-# psql
postgres-# alter user narjes with encrypted password '123456';
ERROR:  syntax error at or near "createuser"
LINE 1: createuser narjes
        ^
postgres=# createuser narjes
postgres-#