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if i type "su-", i get a window error, saying impossible to open file:///home/elishac/su-, and if i type "su -", nothing happens (edit: except that the command line window closes)
Did you have a root password set on your previous version before upgrading?
Just remembered something about Ubuntu. The root user doesn't have a root password if I'm not mistaking, thus not allowing him to login. The preferred way of Ubuntu is to have the users use sudo command. Since the post repo references specifically that it doesn't work in combination with sudo you'll have to set a password for the root account.
sudo passwd root
normally it will ask for your password (the one of your account). Next it will prompt for the new password for the root user, and you'll have to confirm it.
After that is done, try the su - command again but when prompted for the password type in the one you've given to the root user, not your own.
If that works then proceed with the commands from the blog. Hope it works out.