Only one software management tool is allowed to run!

[c4v3m4n]

Usually that just means that synaptic and/or update manager are running at the same time, or you're running one of them and trying to install through terminal.

[Etamami]

TADA: now updates work again!

THANKS mikewhatever, jolx and ushaba!

[jolx]

open synaptic and go ->edit ->fix broken packages

EDIT:soz too late

[Etamami]

open synaptic and go ->edit ->fix broken packages

EDIT:soz too late

Well, it sad "Succesfully fixed dependency problems", so I guess it's all right now. At least now I can istall again, and also update.

THX AGAIN!