Postgresql the database cluster initialisation failed - postgresql

I am getting this error while installing postgresql on windows 10 server, how can I solve it? Postgresql version:15

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Impossible to connect to a PostgreSQL server after a new installation

I have installed postgresql on my new laptop (on Windows).
I see the service postgresql-x64-11 - PostgreSQL Server 11 is running and is automatic. Perfect.
I have installed "dbeaver" (21.21). I would like to create my first database via dbeaver. I always get this message:
Database postgres does not exist
Is it possible to create a database with dbeaver ? Or not ? Or must I do the creation with some command lines ?

Postgresql Service stopped running

I am running PostgreSQL v9.6 on windows 10. Today I tried using a program that uses PostgreSQL Databases and couldn't connect to it. I went to the Services menu in Computer Management and noticed PostgreSQL wasn't running. I tried to run it and received
When I goto PGAdmin4 both Databases are still running however.

Failed to initialise Postgres DB cluster on windows

I am beginning in postgresql, and I have this problem after installing it on windows. Any idea?
First Run the PostgreSQL installer using Adminitsrator

DB2 backup error

We've a DB2 10.5 instance running on Windows 2008 R2 server. This instance has 10 databases. We have been encountering the following error while performing an offline backup of one of the databases. The error occurs every 5 mins for more than an hour and at some point it is able to get an exclusive connection and backup this database
SQL1035N The operation failed because the specified database cannot
be connected to in the mode requested.
We tried the following:
db2 quiesce instance with restricted access and force connections
db2 deactivate database
db2 backup
db2 activate
db2 unquiesce instance
Before this, we also tried a force application all and db2terminate but was in vain. Has anyone encountered such and error before? Appreciate your thoughts and thanks for your time.
Regards,

How can I prevent connection error to postgreSQL database after computer restart?

I tried this several times:
I have windows 7. I installed postgresql 9.6.1.-1. I can connect via pgAdmin 4 to the database. But as soon as I restart the PC, I get a connection error: