[root@rcxnet apt]#   apt-get install yum
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
   elfutils (0.96-1)
   gmp (4.1.4-3)
   libxml2 (2.6.16-3)
   libxml2-python (2.6.16-3)
   python (2.3.4-13.1)
   rpm (4.3.3-3.0.fc3.1)
   rpm-python (4.3.3-3.0.fc3.1)
The following packages will be upgraded
   rpm (4.3.2-21 => 4.3.3-3.0.fc3.1)
The following NEW packages will be installed:
   elfutils (0.96-1)
   gmp (4.1.4-3)
   libxml2 (2.6.16-3)
   libxml2-python (2.6.16-3)
   python (2.3.4-13.1)
   rpm-python (4.3.3-3.0.fc3.1)
   yum (2.2.2-0.fc3)
1 upgraded, 7 newly installed, 0 removed and 35 not upgraded.
Need to get 7904kB of archives.
After unpacking 26.4MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://ayo.freshrpms.net fedora/linux/3/i386/core elfutils 0.96-1 [137kB]
Get:2 http://ayo.freshrpms.net fedora/linux/3/i386/core gmp 4.1.4-3 [550kB]
Get:3 http://ayo.freshrpms.net fedora/linux/3/i386/updates libxml2 2.6.16-3 [634kB]
Get:4 http://ayo.freshrpms.net fedora/linux/3/i386/tupdates rpm 4.3.3-3.0.fc3.1 [572kB]
Get:5 http://ayo.freshrpms.net fedora/linux/3/i386/updates python 2.3.4-13.1 [5083kB]
Get:6 http://ayo.freshrpms.net fedora/linux/3/i386/tupdates rpm-python 4.3.3-3.0.fc3.1 [83.3kB]
Get:7 http://ayo.freshrpms.net fedora/linux/3/i386/updates libxml2-python 2.6.16-3 [450kB]
Get:8 http://ayo.freshrpms.net fedora/linux/3/i386/updates yum 2.2.2-0.fc3 [395kB]
Fetched 7904kB in 12s (618kB/s)
Checking GPG signatures...
Unknown signature /var/cache/apt/archives/rpm_4.3.3-3.0.fc3.1_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#30c9ecf8)
Unknown signature /var/cache/apt/archives/rpm-python_4.3.3-3.0.fc3.1_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#30c9ecf8)
E: Error(s) while checking package signatures:
0 unsigned package(s)
2 package(s) with unknown signatures
0 package(s) with illegal/corrupted signatures
[root@rcxnet apt]#