Node Source's Docker image of Ubuntu runs apt-get upgrade, not apt-get dist-upgrade, to install latest version of all packages.
apt-get dist-upgrade is considered a command to upgrade kernel related packages. In Docker container, kernel packages are not installed because host's kernel is used, and apt-get upgrade looks enough.
However, man page of apt-get says:
dist-upgrade in addition to performing the function of upgrade,
also intelligently handles changing dependencies with new versions
of packages
According to this, other packages may require to run apt-get dist-upgrade to install latest patch.
Are there such packages which requires apt-get dist-upgrade in the current or past releases of Ubuntu?
If such packages exists, we need to run dist-upgrade even in Docker container.