apt-get install postgresql-9.4, updating, trying again etc etc. It seems I can't install it:
Couldn't find any package by regex 'postgresql-9.4'
I know there is a similar question in askubuntu but the answer there doesn't work either.
I need postgresql version 9.4 cause I'm doing a pg:backup from Heroku and I get this error if I don't have 9.4.
Thanks a lot for your help.