+# check if we can lock the cache and if the cache is clean
+if ! apt-get check -q -q 2>/dev/null; then
+ echo "$0: could not lock the APT cache"
+ exit 1
+fi
+
+# set the proxy based on the admin users gconf settings
+admin_user=$(getent group admin|cut -d: -f4|cut -d, -f1)
+if [ -n "$admin_user" ] && [ -x /usr/bin/sudo ] && [ -z "$http_proxy" ] && [ -x /usr/bin/gconftool ]; then
+ use=$(sudo -u "$admin_user" gconftool --get /system/http_proxy/use_http_proxy)
+ host=$(sudo -u "$admin_user" gconftool --get /system/http_proxy/host)
+ port=$(sudo -u "$admin_user" gconftool --get /system/http_proxy/port)
+ if [ "$use" = "true" ] && [ -n "$host" ] && [ -n "$port" ]; then
+ export http_proxy="http://$host:$port/"
+ fi
+fi
+
+# sleep random amount of time
+random_sleep
+
+# check again if we can access the cache
+if ! apt-get check -q -q 2>/dev/null; then
+ exit 1
+fi
+