unable to add/remove applications..hate this computer!

[noahsmommy]

i have a dell mini 9(eww I know).. i have had many many issues with this stupid computer.. i wouldnt use it, if i hadnt gotten it for free with my husbands studio 17. I am trying to remove programs, to clear some space, because its saying my hard drive is at 99%.

whenever I "uncheck" a program to remove, and actually try to remove it then.. it gives me this error:

E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.
E: _cache->open() failed, please report.

what is wrong? how can i fix?
I tried to type the dpkg configure thing into the terminal, but it say something about a superuser.
I am so sick of this computer..
I just want to use it for the internet at work and occasionally to write out a few things. I do not play the games, I do not print crap, I don't even use it for my photos because it sucks so much. So ANY help is greatly appreciated.

[Lars Ljung (larslj)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs .