1. Install pgloader into system:

Download pgloader

OR Run

$ apt-get install pgloader

2. create config file and add below code to file: [ex: pgloader.conf]

load database
from mssql://Username:Password@Host:Port/dbname
into postgresql://Username:Password@Host:Port/dbname
ALTER SCHEMA 'dbo' RENAME TO 'public';

3. run following command in terminal:

pgloader pgloader.conf

Click here for more info

Thank You