Hm… A day ago I was playing to make some enhasments on mysql, and suddenly nerved I have closed terminal without waiting debconfig to finish his job… Then after trying to make some

sudo apt-get install XXXXX

command I have got

debconf: DbDriver “config”: /var/cache/debconf/config.dat is locked by another process

error.. Was terrible, but solution is very simple….

Just you do

sudo rm  /var/cache/debconf/config.dat

if then you will get the same error but about passwords.dat and templates.dat then do also

sudo rm  /var/cache/debconf/templates.dat

sudo rm  /var/cache/debconf/passwords.dat

For me it worked, for you you can try on your own……