I get this error too, I tryed to install Proxmox 3.5 first and got same failiure, downloaded proxmox-ve_4.2-725d76f0-28.iso and burnt on 3 different cd's all got the same error,
(Proxmox)
command 'chroot /target dpkg --force-confold --configure -a' failed with exit code 1 at /usr/bin/proxinstall line 334.
I then reboot format the hdd and try to install all over again
can the proxmox people explain this to a potential customer.
My Rig is a fujitsu primergy tx200 s5 w quadcore 5600 cpu and 8gig ram ad a 3.5 sata disk it also has a raidcard but I'm not into raid yet.