Please if You still have this problem do in the Terminal the next
command for fixing the problem and copy here the output:
sudo dpkg --configure -a
Thank You for making Ubuntu better.
** Changed in: software-center (Ubuntu)
Status: New => Incomplete
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E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to
correct the problem. E: _cache->open() failed, please report.
https://bugs.launchpad.net/bugs/461658
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