The documentation makes clear that ‘--only-upgrade’ applies its
restriction to the packages specified on the command line only.  Its
purpose is to prevent the user accidentally asking for new software.  It
is not intended to restrict upgrades of existing software including e.g.
if such an upgrade requires a new dependency to be installed.

I do not believe ‘--only-upgrade’ should have its scope changed as
requested.

Aptitude supports a ‘--no-new-installs’ option to achieve the desired
behaviour, however, after some consideration of the matters I do not
believe that it is useful enough to justify the additional complexity in
the implementation.


** Summary changed:

- apt-get --only-upgrade install $PKG installs new packages
+ 'apt-get install --only-upgrade' should prevent installing new dependencies

** Changed in: apt (Ubuntu)
       Status: Invalid => Opinion

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https://bugs.launchpad.net/bugs/988772

Title:
  'apt-get install --only-upgrade' should prevent installing new
  dependencies

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