Multiple Installation of Postgresql in Windows 10 and subsystem Ubuntu

Question

Before I have used windows and git bash, Postgresql (13.1) has been installed. The path has been added:

And it worked well.

Later, I have to use Ubuntu (Windows Subsystem), then I use below command to install postgrel in Ubuntu

sudo apt-get install postgresql

It seems below version has been installed:

psql (PostgreSQL) 12.6 (Ubuntu 12.6-0ubuntu0.20.04.1)    

But when running in Ubuntu:

psql

shows error:

psql: error: could not connect to server: No such file or directory          
Is the server running locally and accepting                           
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"? 

Use echo $PATH to check, below two paths have been added:

/mnt/c/Program Files/PostgreSQL/13/lib:/mnt/c/Program Files/PostgreSQL/13/bin

What I can see is that Ubuntu has installed Postgrel 12.6, should this path also be added to the system path? In fact, I couldn't figure out where Postgrel 12.6 being added. And this error is really caused by the path or other reason?

Answer 1

Have tried many kinds of methods. In the end, the below trial works:

1. Run as administrator
2. Remove old postgresql

sudo apt-get remove postgresql 

Result:

[sudo] password for user:                                   
Reading package lists... Done                                                                                                                                               Building dependency tree                        
Reading state information... Done                              
Package 'postgresql' is not installed, so not removed                                                                                                    0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded. 

3. update spt

sudo apt update  

Result:

Building dependency tree                                    
Reading state information... Done                    
21 packages can be upgraded. Run 'apt list --upgradable' to see them. 

sudo apt install postgresql postgrsel-contrib 

Result:

Reading package lists... Done             
Building dependency tree                  
Reading state information... Done                          
E: Unable to locate package postgrsel-contrib  

5. check version

psql --version 
psql (PostgreSQL) 12.6 (Ubuntu 12.6-0ubuntu0.20.04.1)  

sudo service postgrel start 
postgrel: unrecognized service 

sudo apt-get install postgresql postgresql-client

Result:

Success. You can now start the database server using:
pg_ctlcluster 12 main start

8. again

sudo service postgresql start

Now it shows:

starting postgresql 12 database (or similar sentence)

But no prompt up windows
\q to exit

8. use below to reset password:

sudo passwd postgres

You will get a prompt to set password

9. as 'sudo service postgresql start' doesn't work, try below to start postgresql service:

su - postgres

Now it works:

Password:                                                         
Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 4.4.0-18362-Microsoft x86_64)
postgres=# 

It seems that
step 7 helps to get the server running,
step 8 set the password to postgrel,
step 9 gives another way to start postgres service when sudo command doesn't work.

These are all of my trials. You might skip some steps when you run it.