I finally installed VirtualBox and tested the Sage-4.6.2.ova.
unfortunatly I get:
python:error while loading shared libraries: /home/sage/sage/local/lib/
libpython2.6.si.1.0: invalid ELF header.
after booting, so I can't start sage.

It took me a moment to figure out that one has to rename the *.ova
into a *.tar and then untar it to get the *.ovf file.
Also the Virtual machine needs 4GB on harddisk. Mine is chronically
full so I had to clean up a bit to get it running.
Initial startup needed > 5 minutes for me with my low spec desktop
(including the conversion from ovf to vdmk)

As comparison I run the official sage 4.6 vm image. I was able to run
it in Vbox, but couldn't get a network connection for the sage server
to the host. The same  happened with my sage light vm image.

Howto run vmdk files in Vbox:
press New button -> Create New Virtual Machine Window opens
press Next button -> VM Name and OS Type Window opens
type in a Name, select Operating System: Linux, Version: Linux 2.6
press Next -> Memory Window opens, select 512 MB
press Next -> Virtual Hard Disk Window opens
check "Boot Hard Disk" and select "Use existing hard disk"
Select the vmdk file you want to run (e.g. sage-vmware.vmdk)
press Next -> Summary Window opens
press Finish -> your machine will appear in the left column of the
main Window
Click it to highlight it and then select "Start"

Maybe somebody can also give a clue how to fix the networking with the
host machine, so that you can access the sage server from the host
browser? Maybe somewhere in the settings of Vbox?

Some comparison:
all machines were run with 512 MB of Base memory and 1 processor

Sage 4.6.2:
Base Fedora
Download Size 1.4 GB (as ova)
vmdk size installed: 3.9 GB
Max Disk Size 7.81 GB
Boots into CLI desktop
Boot time: 1 min 25 sec
Shut down time: 13 sec

Sage 4.6 official VM image:
Base Ubuntu
Download Size 1 GB
vmdk size installed 4.5 GB
Max Disk Size 20 GB
Boots into GUI desktop
Boot time 1 min 10 sec
Shut down time: couldn't "Shutdown", had to power off (0 sec)

Sage 4.6 VM light (sage stripped)
Base Puppy
Download size 400 MB
vmdk size installed 478 MB
Max Disk Size 4GB
boots into GUI desktop
Boot time: ca 1 min 40 sec
Shut-down time: 15 sec

just my feedback :-)

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