Envoyé par man 8 aptitude
safe-upgrade
Upgrades installed packages to their most recent version. Installed
packages will not be removed unless they are unused (see the
section “Managing Automatically Installed Packages” in the aptitude
reference manual). Packages which are not currently installed may
be installed to resolve dependencies unless the --no-new-installs
command-line option is supplied.
It is sometimes necessary to remove one package in order to upgrade
another; this command is not able to upgrade packages in such
situations. Use the full-upgrade command to upgrade as many
packages as possible.