repos

[tony@stg.hidro.cu]

tengo el siguiente problemas uso este script con debmirror para 
actualizar mis repos:

# Mirror host
FROM=mirrors.kernel.org

# Archive location
TO=/home/repositorios/distros/debian-jessie

# -----

DATE=$(date "+%Y-%m-%d")
DATE_FILENAME=$(date "+%Y-%m-%d__%H.%M.%S")
DATE_LOGHEADER=$(date "+%d %b %Y - %H:%M:%S")

BASELOGDIR=/var/log/repos
LOGDIR=$BASELOGDIR/$DATE
LOGFILE=$LOGDIR/debian-jessie_sync-$DATE_FILENAME.log
# Establecer mascara de permisos
umask 0077

# Crear directorios y archivos de registros en caso de que  no existan
mkdir -p $LOGDIR
touch $LOGFILE

echo "---------------------------------------------" >> $LOGFILE
echo " Registro de eventos de sincronizacion de la " >> $LOGFILE
echo " rama Principal del Repositorio de Debian    " >> $LOGFILE
echo "" >> $LOGFILE
echo " $DATE_LOGHEADER" >> $LOGFILE
echo "---------------------------------------------" >> $LOGFILE
echo "" >> $LOGFILE

# Delete temp folder first
rm -rf $TO/.temp/
# Main archive
debmirror \
    --passive \
    --progress \
    --verbose \
    --host=$FROM \
    --root=debian \
    --dist=jessie \
    --section=main,contrib,non-free \
    --arch=i386,amd64 \
    --timeout=1600  \
    --method=https \
    --cleanup \
    --nosource \
    --ignore-small-errors \
    --diff=none \
    --proxy=http://stg:Dprh2015*@10.10.2.240:8080/ \
    --rsync-extra=none \
    $TO >> $LOGFILE 2>&1







y me tira el sgt error: nesecito de su ayuda estoy sin poder actualizar 
mi repo y ya no se que hacer



gpgv: Can't check signature: No public key
gpgv: Signature made sáb 23 jun 2018 06:31:33 CDT
gpgv:                using RSA key 
126C0D24BD8A2942CC7DF8AC7638D0442B90D010
gpgv: Can't check signature: No public key
gpgv: Signature made sáb 23 jun 2018 07:08:39 CDT
gpgv:                using RSA key CBF8D6FD518E17E1
gpgv: Can't check signature: No public key
.temp/.tmp/dists/jessie/Release.gpg signature does not verify.
Errors:
 .temp/.tmp/dists/jessie/Release.gpg signature does not verify