I tried to install some programs, but because of a very slow connection I didn't succeed.
Now, when I use a normal fast connection, when I want to instal something, flashplayer or VLC, then I get the message: Previous installation has not been completed. The installation could have failed bacause of an error in the corresponding software package or it was cancelled in an unfriendly way. You have to repair this before you can install or remove any further software.
Clicking the "repair" button doesn't help. What can I do about this?