linux-source-4.18 and other old kernel-related packages are uninstallable in sid

[s3v <c0llapsed@yahoo.it>]

Hi,
I dont't know if this mailing list is appropriate for my request, please
redirect me if I'm in a wrong place.
I would like to ask you to clarify this situation:

1) linux-source-4.18 is in Translation-en.bz2 file [1] ...
2) ... but linux-source-4-18 is uninstallable in Sid
3) anyway linux-source-4.18 is shown as "active" by UDD :|

    udd=> select package, architecture, release from packages where
package ~ '^linux.*4.1[1-8].*' and release='sid';

	 linux-doc-4.15                   | all          | sid
	 linux-doc-4.16                   | all          | sid
	 linux-doc-4.17                   | all          | sid
	 linux-doc-4.18                   | all          | sid
	 linux-headers-4.15.0-2-common    | all          | sid
	 linux-headers-4.15.0-3-common    | all          | sid
	 linux-headers-4.16.0-1-common    | all          | sid
	 linux-headers-4.16.0-2-common    | all          | sid
	 linux-headers-4.16.0-2-common-rt | all          | sid
	 linux-headers-4.17.0-1-common    | all          | sid
	 linux-headers-4.17.0-2-common    | all          | sid
	 linux-headers-4.17.0-3-common    | all          | sid
	 linux-headers-4.18.0-1-common    | all          | sid
	 linux-headers-4.18.0-1-common-rt | all          | sid
	 linux-headers-4.18.0-2-common    | all          | sid
	 linux-headers-4.18.0-2-common-rt | all          | sid
	 linux-headers-4.18.0-3-common    | all          | sid
	 linux-headers-4.18.0-3-common-rt | all          | sid
	 linux-source-4.15                | all          | sid
	 linux-source-4.16                | all          | sid
	 linux-source-4.17                | all          | sid
	 linux-source-4.18                | all          | sid
	 linux-support-4.15.0-2           | all          | sid
	 linux-support-4.15.0-3           | all          | sid
	 linux-support-4.16.0-1           | all          | sid
	 linux-support-4.16.0-2           | all          | sid
	 linux-support-4.17.0-1           | all          | sid
	 linux-support-4.17.0-2           | all          | sid
	 linux-support-4.17.0-3           | all          | sid
	 linux-support-4.18.0-1           | all          | sid
	 linux-support-4.18.0-2           | all          | sid
	 linux-support-4.18.0-3           | all          | sid

All the packages above are in the same situation. Why?

Thanks for your work to make Debian even better!

Kind regards.


[1] http://ftp.debian.org/debian/dists/sid/main/i18n/