What is the difference between APTupgrade and dist-upgrade? E

What is the difference between APTupgrade and dist-upgrade? E -- Debian information of the Linux release technology. The following is a detailed description. Debian/Ubuntu Linux uses apt, Which is used during upgrade:

Apt-get update
Apt-get upgrade
Apt-get dist-upgrade

However, it is often asked what is the difference between upgrade and dist-upgrade. It seems that you have different interpretations of upgrade and dist-upgrade, and record your views here.

I think the difference between apt-get upgrade and dist-upgrade is as follows:

Upgrade: The system upgrades the existing Package. If there is a dependency problem, and this dependency requires the installation of other new packages or affects the dependency of other packages, this Package will not be upgraded and will be retained.

Dist-upgrade: It can intelligently solve dependency problems. If dependency problems exist, you need to install/remove a new Package and then try to install/remove it. (This is usually considered a risky upgrade)

Man apt-get:

Upgrade: upgrade is used to install the newest versions of all packages currently installed on the system from the sources enumerated in/etc/apt/sources. list. packages currently installed with new versions available are retrieved and upgraded; under no circumstances are currently installed packages removed, or packages not already installed retrieved and installed. new versions of currently installed packages that cannot be upgraded without changing the install status of another package will be left at their current version. an update must be specified med first so that apt-get knows that new versions of packages are available.
Dist-upgrade: dist-upgrade in addition to specify the function of upgrade, also intelligently handles changing dependencies with new versions of packages; apt-get has a "smart" conflict resolution system, and it will attempt to upgrade the most important packages at the expense of less