ReadyNAS OS 6.0.6 | VirtualBox Image #notsupported

Thought I'd give this a go on VBox which I have running happily on the Ultra 2+...

What /apt/source.list are you using Chirpa if I may ask? I'm trying with my usual lists that I find works for me, but I'm hitting dependency errors for out-dated stuff. (4.2.23-T6)

 apt-get -y install syslinux-common;apt-get -y install syslinux mtools
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package syslinux-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
  libcurl4-openssl-dev: Depends: libcurl3 (= 7.19.7-1.netgear2) but 7.19.7-1.netgear1 is to be installed
  libncurses5-dev: Depends: ncurses-bin (= 5.7+20100313-5) but 5.5-5 is to be installed
  uuid-dev: Depends: libuuid1 (= 1.41.14-1.netgear1) but 1.42.7-1.netgear2 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). 

Is there a simple solution? (I'm calling it a day now anyway, gotta be up early on the morn, so no urgency required really)