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

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 .

Please see FAQ #52 for the answer to your problem

yes, just try going back up to the top taskbar and click on

Applications - Accessories - Terminal

and into the terminal/command window/console type

sudo dpkg --configure -a

it asks for your normal user password, not your SuperUser/Root one. Hopefully that should fix the problem :)

Good luck and regards from
Tom :)

add:
http://doc.ubuntu-es.org/Apt

If you are still having trouble with this then please post it as a new question. Only the most recent questions tend to get looked at so posting/re-posting a question just before america arrives online after work/school gives the best chance of getting a good few answers - such is the nature of the internet.
https://answers.launchpad.net/ubuntu/+addquestion

If the problem has been resolved then please follow the link to the forum thread and mark it as Solved but please give us a clue how you did manage to solve it and also use the button under where you type stuff in rather than giving me karma credit points for just sending this note to you.

Apologies, good luck and many regards from
Tom :)