Hi,
You must have the same problem like me, i guess.
yesterday, i've exactly the same error when i tried upgrade my ferora core 6
Code:
# > yum update yum
[...]
Missing Dependency: python(abi) = 2.4 is needed by package authconfig
reason : in fedora 7, python must be updated to version 2.5 and lot's of packages in fedora 6 (during upgrade or something else) work with python 2.4
reason 2: last authconfig package is 5.3.18-0.1.fc6 but during upgrade to FC7, yum tries to install authconfig with version 5.3.15-1.fc7: do you think what i mean ?
which reason is right ? I don't know but I decided to erase authconfig and prayed very extremely
Code:
# > yum erase authconfig
[...]
=============================================================================
Package Arch Version Repository Size
=============================================================================
Removing:
authconfig i386 5.3.18-0.1.fc6 installed 1.7 M
Removing for dependencies:
authconfig-gtk i386 5.3.18-0.1.fc6 installed 183 k
firstboot noarch 1.4.23-1 installed 933 k
firstboot-tui noarch 1.4.23-1 installed 621 k
Transaction Summary
=============================================================================
[y/N]: y
[...]
# > yum -y update yum
[...] // no else error found
# > yum -y upgrade
[...]
good!
Et voilą
Momorabit (sorry for my english

)