apt-get dist-upgrade problems

[QuickSilver]

I am using ubuntu (as far as I know it is very similar to debian). Yesterday, I wanted to upgrade my dist so I typed

sudo apt-get dist-upgrade

and got this wierd message :

WARNING: The following packages cannot be authenticated!
  libgcc1 file-roller firefox-gnome-support mozilla-firefox-gnome-support
  mozilla-firefox firefox hpijs foomatic-db-hpijs gaim gaim-data gimp
  gimp-data libgimp2.0 gimp-python gnome-btdownload libgnome-menu0 gnome-menus
  gtk2-engines-clearlooks powernowd python-xdg python2.4-samba smbclient
  samba-common synaptic totem totem-gstreamer xchat xchat-common
  foomatic-filters-ppds libsmbclient
Install these packages without verification [y/N]? y

Well, without any questions I said yes and it downloaded the packages. However, when it installed mozilla firefox package, it gave me this error message :

Unpacking replacement mozilla-firefox ...
dpkg: warning - unable to delete old file `/etc/mozilla-firefox/profile/extensions': Directory not empty
dpkg: warning - unable to delete old file `/etc/mozilla-firefox/profile/chrome': Directory not empty
dpkg: warning - unable to delete old file `/etc/mozilla-firefox/profile': Directory not empty
dpkg: warning - unable to delete old file `/etc/mozilla-firefox/pref': Directory not empty
dpkg: warning - unable to delete old file `/etc/mozilla-firefox': Directory not empty
dpkg: warning - unable to delete old file `/usr/lib/mozilla-firefox/plugins': Directory not empty
dpkg: warning - unable to delete old file `/usr/lib/mozilla-firefox': Directory not empty
dpkg: warning - unable to delete old file `/var/lib/mozilla-firefox/extensions': Directory not empty
dpkg: warning - unable to delete old file `/var/lib/mozilla-firefox': Directory not empty
Selecting previously deselected package firefox.
Unpacking firefox (from .../firefox_1.0.6-1ubuntu1~5.04ubp1_i386.deb) ...

Later, it kept unpacking and installing the other packages (went well!). After installing all the packages, I got this error :

You might want to run `apt-get -f install' to correct these.
The following packages have unmet dependencies:
  mozilla-firefox-gnome-support: Depends: firefox-gnome-support but it is not in stalled
E: Unmet dependencies. Try using -f.

and again, I had no chance but to do what it recommended :

sudo apt-get -f install

What I want to know is did I do the right thing? Do I have to worry about the error messages, it gave me during the dist-upgrade?

[Vergil83]

the reason it asked for verification is because it is a new feature of apt-get that is going to make apt more secure. Not all sites have add the necessary features. So this is no problem.

The other problem seems like a dependency problem. you did the right thing.

[QuickSilver]

Alright then! THX Vergil83, you're the man!!!

[St. Joe]

Be sure that gnupg's installed, then do:
# gpg --keyserver keyring.debian.org --recv 4F368D5D

Or you can do it on a pkg by pkg basis:
# apt-get --allow-unauthenticated install packagename

If you don't wish to add this flag each time you can store the following text inside /etc/apt/apt.conf (creating that file if it's missing):

APT::Get::AllowUnauthenticated 1 ;

[Mystic_Slayer]

The most time you need to do this:

apt-get update

and then you should go for a dist-upgrade.

This will solve problems with dependencies, etc.