Oué, enfin chiant ^^

workgroup:~# apt-get install vsftpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
libcap1
The following NEW packages will be installed:
libcap1 vsftpd
0 upgraded, 2 newly installed, 0 to remove and 37 not upgraded.
Need to get 128kB of archives.
After this operation, 487kB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
libcap1 vsftpd
Install these packages without verification [y/N]? y
Err http://ftp.fr.debian.org lenny/main libcap1 1:1.10-14
Could not resolve 'ftp.fr.debian.org'
Err http://ftp.fr.debian.org lenny/main vsftpd 2.0.7-1
Could not resolve 'ftp.fr.debian.org'
Failed to fetch http://ftp.fr.debian.org/debian/pool/main/libc/libcap/libcap1_1.10-14_i386.deb Could not resolve 'ftp.fr.debian.org'
Failed to fetch http://ftp.fr.debian.org/debian/pool/main/v/vsftpd/vsftpd_2.0.7-1_i386.deb Could not resolve 'ftp.fr.debian.org'E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

je m'exécute :

workgroup:~# apt-get update
Err http://volatile.debian.org lenny/volatile Release.gpg
Could not resolve 'volatile.debian.org'
Err http://security.debian.org lenny/updates Release.gpg
Could not resolve 'security.debian.org'
Err http://security.debian.org lenny/updates/main Translation-en_US
Could not resolve 'security.debian.org'
Err http://volatile.debian.org lenny/volatile/main Translation-en_US
Could not resolve 'volatile.debian.org'
Err http://ftp.fr.debian.org lenny Release.gpg
Could not resolve 'ftp.fr.debian.org'
Err http://ftp.fr.debian.org lenny/main Translation-en_US
Could not resolve 'ftp.fr.debian.org'
Err http://ftp.fr.debian.org lenny/contrib Translation-en_US
Could not resolve 'ftp.fr.debian.org'
Err http://ftp.fr.debian.org lenny/non-free Translation-en_US
Could not resolve 'ftp.fr.debian.org'
Reading package lists... Done
W: Failed to fetch http://ftp.fr.debian.org/debian/dists/lenny/Release.gpg Could not resolve 'ftp.fr.debian.org'

W: Failed to fetch http://ftp.fr.debian.org/debian/dists/lenny/main/i18n/Translation-en_US.bz2 Could not resolve 'ftp.fr.debian.org'

W: Failed to fetch http://ftp.fr.debian.org/debian/dists/lenny/contrib/i18n/Translation-en_US.bz2 Could not resolve 'ftp.fr.debian.org'

W: Failed to fetch http://ftp.fr.debian.org/debian/dists/lenny/non-free/i18n/Translation-en_US.bz2 Could not resolve 'ftp.fr.debian.org'

W: Failed to fetch http://security.debian.org/dists/lenny/updates/Release.gpg Could not resolve 'security.debian.org'

W: Failed to fetch http://security.debian.org/dists/lenny/updates/main/i18n/Translation-en_US.bz2 Could not resolve 'security.debian.org'

W: Failed to fetch http://volatile.debian.org/debian-volatile/dists/lenny/volatile/Release.gpg Could not resolve 'volatile.debian.org'

W: Failed to fetch http://volatile.debian.org/debian-volatile/dists/lenny/volatile/main/i18n/Translation-en_US.bz2 Could not resolve 'volatile.debian.org'

W: Some index files failed to download, they have been ignored, or old ones used instead.W: You may want to run apt-get update to correct these problems

Comprend pas, ça avait bien marché pourtant quand j'avais installé le reste au début.