aptitude upgrade - deleting old directories

[Γιώργος Πάλλας <gpall@ccf.auth.gr>]

I upgraded today my testing:

Preparing to replace alsa-utils 1.0.16-2 (using 
.../alsa-utils_1.0.19-2_i386.deb) ...
Unpacking replacement alsa-utils ...
dpkg: warning - unable to delete old directory 
`/etc/alsa/modprobe-post-install.d': Directory not empty
dpkg: warning - unable to delete old directory `/etc/alsa': Directory 
not empty

Is it safe to delete manually the 'old directory' ? Is it really unused?

Asking because I see afterwards that the package still uses the directory...

aris:/home/encmp/gpall# dpkg -L alsa-utils
/.
/lib
...
...
/etc/alsa/modprobe-post-install.d/alsa-utils

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