postgres@Aspire:/home/XXX$ createuser dev
Shall the new role be a superuser? (y/n) n
Shall the new role be allowed to create databases? (y/n) y
Shall the new role be allowed to create more new roles? (y/n) y

然后创建一个数据库：

postgres@Aspire:/home/XXX$ createdb -O dev test_development

之后，我尝试用psql -U dev -W test_development登录，但得到错误：

psql: FATAL:  Peer authentication Failed for user "dev"

我试图解决问题，但失败。