è vero, non lo avevo installato, infatti ho riprovato a installarlo con apt e mi da questi errori:
Lettura della lista di pacchetti... Done
Calcolo dell'albero delle dipendenze... Done
Verranno installati i seguenti pacchetti extra:
giFT giFT-openft libgiFT libtool
Saranno installati i seguenti pacchetti NUOVI:
apollon giFT giFT-openft libgiFT libtool
0 upgraded, 5 newly installed, 0 removed and 53 not upgraded.
Need to get 0B/2283kB of archives.
After unpacking 6607kB of additional disk space will be used.
Vuoi proseguire? [S/n] s
Checking GPG signatures...
Unknown signature /var/cache/apt/archives/libtool_1.5.8-0.gbv.1_i586.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#b7afc211)
Unsigned /var/cache/apt/archives/libgiFT_0.11.6-4_i586.rpm: sha1 md5 OK
Unknown signature /var/cache/apt/archives/giFT-openft_0.2.1.4-1_i586.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#153b0eb8)
Unsigned /var/cache/apt/archives/giFT_0.11.6-4_i586.rpm: sha1 md5 OK
Unknown signature /var/cache/apt/archives/apollon_1.0-1beta1_i586.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#153b0eb8)
E: Error(s) while checking package signatures:
2 unsigned package(s)
3 package(s) with unknown signatures
0 package(s) with illegal/corrupted signatures
idee?