removing bash and base-files during upgrading?

[Alexander <alexjede@gmx.de>]

Hi,
i wanted to upgrade my pure64-sid.
running apt-get dist-upgrade i get the following message:
Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Done
The following packages will be REMOVED:
  base-files bash cupsomatic-ppd deborphan foomatic-db
foomatic-db-engine
  foomatic-db-gimp-print foomatic-db-hpijs foomatic-filters
  foomatic-filters-ppds gnome-desktop-environment gnome-volume-manager
hal
  hal-device-manager hotplug mailx printconf python-foomatic udev
The following packages have been kept back:
  openoffice.org-debian-files
The following packages will be upgraded:
  ia32-libs libc6 libc6-dev locales
WARNING: The following essential packages will be removed
This should NOT be done unless you know exactly what you are doing!
  base-files bash
4 upgraded, 0 newly installed, 19 to remove and 1 not upgraded.
15 not fully installed or removed.
Need to get 12,8MB/22,1MB of archives.
After unpacking 63,1MB disk space will be freed.
You are about to do something potentially harmful
To continue type in the phrase 'Yes, do as I say!'
 ?] 

is this all right? should be the packages bash and base-files removed or
is there a mistake?

-- 
Alexander Jede <alexjede@gmx.de>