debian won't authenticate me in package manager

Are you speaking about Debian installed as a virtual appliance? If yes, login as parallels user and when installing packages enter password that you submitted on the very first login into this system.
 
Ok, I see. In our current appliance version "parallels" user is not added into admins in policykit :-( So I suggest you to set up root password and use it for authentication as Administrator. For this do in terminal:
sudo passwd
First it will require you to enter your current password of "parallels" user:
[sudo] password for parallels:
and then new password for root:
Enter new UNIX password:
Retype new UNIX password:

- specify good complex password. After that when Debian's GUI asks you to authenticate as Administrator - enter root's password.
 
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