I Installed PGadmin9+ in my ubuntu machine few month back but i lost the password of default database postgres . Now when i am trying to connect with postgres DB i am getting error 
Error connecting to the server: FATAL:  password authentication failed for user "postgres"
How to change the password? or recover it?
I did not installed PostgreSQL   from command prompt so This SOlution  is not working any alternative solution.
 
    