[Aptitude-devel] Version number matching question

[Jonas Bechtel]

Hey there,

I've got a question: I try to update evince-common, which is not possible because it breaks the evince package. 
Aptitude then looks like this:

  Origin URI: http://security.debian.org/pool/updates/main/e/evince/evince_3.30.2-3+deb10u1_i386.deb
  --\ Depends (19)
    --- dconf-gsettings-backend | gsettings-backend
    --\ evince-common:all (< 3.31) (UNSATISFIED)
idA   evince-common 3.30.2-3                                                -11.0 MB                               
    --\ evince-common:all (>= 3.30) (UNSATISFIED)
idA   evince-common 3.30.2-3                                                -11.0 MB                               


The installation overview looks like this:

--\ Packages with unsatisfied dependencies (1)
iB   evince:i386                                                                      3.30.2-3+deb10 3.30.2-3+deb10
--\ Packages to be upgraded (1)
iuA  evince-common                                                                    3.30.2-3       3.30.2-3+deb10
--\ Packages being held back (969)


Package view shows me:

Some dependencies of evince:i386 (broken, 3.30.2-3+deb10u1) are not satisfied:                                    ▒
                                                                                                                  ▒
  * evince:i386 (held/unchanged, 3.30.2-3+deb10u1) depends on evince-common:all (< 3.31) (provided by             ▒
    evince-common 3.30.2-3)                                                                                       ▒
                                                                                                                  ▒
                                                                                                                  


So the question here is: why is 

3.30 <= 3.30.2-3 < 3.31
but not
3.30 <= 3.30.2-3+deb10 < 3.31 ?



Best Regards
 Jonas






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