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install postgresql showing errors.
I am trying to deploy my rails app on digital ocean. and am following this article https://gorails.com/deploy/ubuntu/18.04
but when i am trying to run this command
sudo apt-get install postgresql postgresql-contrib libpq-dev
it is showing the following errors.
Reading package lists... Done Building dependency tree Reading state information... Done libpq-dev is already the newest version (11.2-1.pgdg16.04+1). Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: postgresql : Depends: postgresql-11 but it is not going to be installed postgresql-contrib : Depends: postgresql-contrib-11 E: Unable to correct problems, you have held broken packages.
What is the problem an what should i do.
[I am workign with my new user, not in root user]