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Date: Fri, 27 Mar 2015 08:58:57 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Ivo Karabojkov <karabojkov@kit.bg>
Subject: Re: Troubles with VirtualBox 4.3.26
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On Fri, 27 Mar 2015, Ivo Karabojkov wrote:

> I usually use VirtualBox with VNC and webservice on headless servers.
> I noticed that after any update if the VMs are not turned off but with
> saved state the new version of VirtualBox is unable to start them and
> the process terminates with an error. To start the VMs you should
> discard their states by running (as vboxusers if this is the user who
> runs VirtualBox services):
>
> VBoxManage discardstate <vmname>
>
> This is always necesarry in my case after almost any update of VirtualBox

My VMs were all shut down before the upgrade.

At this point, I have tried multiple versions of the operating system, 
rebuilding everything VirtualBox depends on, removing CPUTYPE from 
make.conf, and twm rather than xfce.  The problem has not changed, 
though.