This is what I got when I tried the recommended solution:
sudo dpkg --configure -a
Password:
dpkg: dependency problems prevent configuration of apache2:
apache2 depends on apache2-mpm-worker (>= 2.2.3-3.2build1) | apache2-mpm-prefork (>= 2.2.3-3.2build1) | apache2-mpm-event (>= 2.2.3-3.2build1); however:
Package apache2-mpm-worker is not installed.
Version of apache2-mpm-prefork on system is 2.0.55-4ubuntu4.
Package apache2-mpm-event is not installed.
dpkg: error processing apache2 (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
apache2
This is what I got when I tried the recommended solution:
sudo dpkg --configure -a
Password:
dpkg: dependency problems prevent configuration of apache2:
apache2 depends on apache2-mpm-worker (>= 2.2.3-3.2build1) | apache2-mpm-prefork (>= 2.2.3-3.2build1) | apache2-mpm-event (>= 2.2.3-3.2build1); however:
Package apache2-mpm-worker is not installed.
Version of apache2-mpm-prefork on system is 2.0.55-4ubuntu4.
Package apache2-mpm-event is not installed.
dpkg: error processing apache2 (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
apache2