[ubuntu] Asking the system not to install dropbox

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http://ubuntuforums.org – Hello, I tried installing dropbox on my Ubuntu 11.10 64 bit using Ubuntu Software Center and after downloading it hanged. (The progress bar stopped moving for over an hour) I shutdown the Laptop as i had to commute and turned it back on later. Now each time I try installing a package using the terminal, it immediately starts to install dropbox which also never completes.(Stays on 99% sometimes 100 for hours) How do I ask the system to quit trying to install dropbox. ( Ctrl C doesn't work either) I just don't want the system to even try to install it at all. Thank you. (Hardware)