errors with yum, what's appening?

[Frédéric Bron]

When I run yum update, this is the type of error I get.
What should I do to come back to a normal situtation?


  Mise à jour  : selinux-policy-3.12.1-119.fc20.noarch
                                                      6/96
warning: %post(selinux-policy-3.12.1-119.fc20.noarch) scriptlet
failed, exit status 127
Non-fatal POSTIN scriptlet failure in rpm package
selinux-policy-3.12.1-119.fc20.noarch
warning: %triggerin(selinux-policy-3.12.1-119.fc20.noarch) scriptlet
failed, exit status 127
Non-fatal <unknown> scriptlet failure in rpm package
selinux-policy-3.12.1-119.fc20.noarch

...

error: %pre(clamav-filesystem-0.98.1-1.fc20.noarch) scriptlet failed,
exit status 127
Error in PREIN scriptlet in rpm package clamav-filesystem-0.98.1-1.fc20.noarch
error: clamav-filesystem-0.98.1-1.fc20.noarch: install failed
Non-fatal POSTIN scriptlet failure in rpm package qpdf-libs-5.1.1-1.fc20.x86_64
error: %preun(NetworkManager-1:0.9.9.0-25.git20131003.fc20.x86_64)
scriptlet failed, exit status 127
Error in PREUN scriptlet in rpm package NetworkManager
error: NetworkManager-1:0.9.9.0-25.git20131003.fc20.x86_64: erase failed
error: %preun(NetworkManager-1:0.9.9.0-24.git20131003.fc20.x86_64)
scriptlet failed, exit status 127
Error in PREUN scriptlet in rpm package NetworkManager

...

14:tcpdump-4.5.0-1.20131108gitb07944a.fc20.x86_64 was supposed to be
removed but is not!
  Vérification : 14:tcpdump-4.5.0-1.20131108gitb07944a.fc20.x86_64
                                                     45/96
selinux-policy-targeted-3.12.1-116.fc20.noarch was supposed to be
removed but is not!
  Vérification : selinux-policy-targeted-3.12.1-116.fc20.noarch
                                                     46/96
yum-3.4.3-129.fc20.noarch was supposed to be removed but is not!