Ubuntu+dpkg+apt-get+aptitude differences

DPKG: underlying package management commands
Apt-get: Advanced Package Management commands for Command mode
Aptitude: Advanced Package Management program for text interface

There's no point in saying it.

Dpkg is only used to install local packages and does not resolve software relationships.
Apt-get and aptitude are installed from the network package (if the file://also as a network environment), to resolve the trust relationship. The difference is that Apt-get does not remove unused packages that have already been installed, and aptitude is more intelligent, and it removes packages that have not been installed. Don't mix apt-get and aptitude, they use different software installation records.

Ubuntu+dpkg+apt-get+aptitude differences