sudo dpkg --configure -a

problem :-

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

ANS:-1.
sudo dpkg --configure -a
apt-get update

sudo apt-get remove dpkg --purge

And:

sudo apt-get install dpkg


ANS:-2.
sudo dpkg --configure -a
sudo apt-get update
sudo apt-get upgrade

ANS:-