I changed the repositaries of linux mint daryna xfce and I updated...
it was a little risky but now all works fine

If you want try, good luck!!
## -------------------
## UBUNTU REPOSITORIES
## +++ Hardy (Ubuntu 8.40) +++
deb
http://archive.ubuntu.com/ubuntu/ hardy main restricted universe multiverse
deb
http://archive.ubuntu.com/ubuntu/ hardy-updates main restricted universe multiverse
deb
http://archive.ubuntu.com/ubuntu/ hardy-security main restricted universe multiverse
# deb
http://archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse
# deb
http://archive.ubuntu.com/ubuntu/ hardy-proposed main restricted universe multiverse
## -----------------------
## LINUX MINT REPOSITORIES
## -----------------------
## Daryna (Linux Mint 4.0)
deb
http://www.linuxmint.com/repository/ daryna main upstream import
# deb
http://www.linuxmint.com/repository/ daryna community backport
## +++ Romeo (Linux Mint Unstable) +++
# deb
http://www.linuxmint.com/repository romeo daryna
## ------------------
## OTHER REPOSITORIES
## ------------------
## +++ Canonical (RealPlayer10, Opera, DesktopSecure etc...) +++
#deb
http://archive.canonical.com/ubuntu/ gutsy partner
deb
http://archive.canonical.com/ubuntu/ hardy partner
## +++ Medibuntu (Codecs and extra applications) +++
#deb
http://packages.medibuntu.org/ gutsy free non-free
deb
http://packages.medibuntu.org/ hardy free non-free
## Wicd Updates
deb
http://wicd.longren.org/ gutsy extras
##