hmm I don't know. Ive been looking into it more in both synaptic and apt
heres what I have found.

There are three categories of packages dependencies, recommended, and 
suggested. 
-Dependencies: these are required for the package to run and are thus always 
selected for installation automatically in fact installation will not continue 
without all dependencies being selected
-Suggested: not required and never selected automatically
-Recommended: these packages appear to be installed sometimes and not others. 
So what determines if they are marked for installation or not. Heres what I 
have seen.

1) New Installation: Selecting a new package for installation appears to select 
all recommended packages for installation as well.
---This needs to be qualified in some cases (ie. gcompris-data) where there are 
many recommended language packages only the correct language gets selected.

2) updates or re-installation of a package: Here it appears to me that
recommended packages are not selected to be installed.

Do you agree that this is the observed behavior? Im not sure if this is
desirable behavior or not. I feel that if package x,y,z were installed
when I first select a packaged I would expect them to be installed when
I select it for re-installation.

Note: Ive also noticed that recommended packages are not removed when a
package is removed. This although likely desirable sometimes leaves
people in the unfortunate situation of having unused packages that were
installed with a package but not removed with it.

I hope im focusing on the same issue that you reported here Ricardo, if
not my apologies.

-- 
APT doesn't installs Recommends dependencies during upgrades
https://bugs.launchpad.net/bugs/284995
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