[squalyl@dedibox ~]$ sudo apt-get update
Get:1 ftp://ftp.proxad.net fedora/linux/releases/8/Everything/i386/os/ repomd.xml [2151B]
Fetched 2151B in 0s (20,8kB/s)
Hit ftp://ftp.proxad.net fedora/linux/releases/8/Everything/i386/os/ primary.sqlite
Hit ftp://ftp.proxad.net fedora/linux/releases/8/Everything/i386/os/ filelists.sqlite
Reading Package Lists... Done
Building Dependency Tree... Done
W: There are multiple versions of "avahi" in your system.
This package won't be cleanly updated, unless you leave
only one version. To leave multiple versions installed,
you may remove that warning by setting the following
option in your configuration file:
RPM::Allow-Duplicated { "^avahi$"; };
To disable these warnings completely set:
RPM::Allow-Duplicated-Warning "false";
W: There are multiple versions of "acpid" in your system.
This package won't be cleanly updated, unless you leave
only one version. To leave multiple versions installed,
you may remove that warning by setting the following
option in your configuration file:
RPM::Allow-Duplicated { "^acpid$"; };
To disable these warnings completely set:
RPM::Allow-Duplicated-Warning "false";
W: You may want to run apt-get update to correct these problems
[squalyl@dedibox ~]$ rpm -q --whatprovides avahi
avahi-0.6.10-1.FC5
avahi-0.6.21-6.fc8
[squalyl@dedibox ~]$ rpm -q --whatprovides acpid
acpid-1.0.4-2
acpid-1.0.6-3.fc8
[squalyl@dedibox ~]$

bon j'ai voulu enlever les miettes à la main, mais...
[squalyl@dedibox ~]$ sudo rpm --erase avahi-0.6.10-1.FC5 acpid-1.0.4-2
Mot de passe :
erreur: %postun(acpid-1.0.4-2.i386) scriptlet failed, exit status 1
erreur: %postun(avahi-0.6.10-1.FC5.i386) scriptlet failed, exit status 1
et y'a pas de --force pour erase !
NB: j'ai pas rebooté une seule fois dans le process!
edit: trouvé \o/
rpm --erase avahi-0.6.10-1.FC5 acpid-1.0.4-2 --nopostun
edit... rebooté!
[squalyl@dedibox ~]$ cat /etc/redhat-release
Fedora release 8 (Werewolf)
[squalyl@dedibox ~]$ uname -a
Linux dedibox 2.6.23.1-42.fc8 #1 SMP Tue Oct 30 13:55:12 EDT 2007 i686 i686 i386 GNU/Linux
[squalyl@dedibox ~]$
mais j'aurais bien voulu un 2.6.24.2, quand même ...