When I reinstalled Ubuntu, I logged in on my wifi and authenticated with a password that seahorse saved in "Default". But I want that in "Login" so that I won't have to enter my password twice everytime i reboot, how can that be done?
From Network Connections.
Click on my Wireless that you connect to automatically when you boot up. Click Edit. And at the very bottom it has a box to make the connection available to all users. Check that box.
---Below is added by OP, text is in Swedish---
And at last
(You may not need the last line, and I backed up the login.keyring rather than deleting it).
This worked for me.