Thank you for that, that will help a lot.  I would be interested in the 7gb 
file.  How do you chroot into your images, do you use a script or an app? 
 I have been using an app, but it doesn't seem to like images that weren't 
made by the app.

On Saturday, December 8, 2012 9:22:20 AM UTC-5, mmarco wrote:
>
> The problem was that the ubuntu image that i was using was armel 
> architecture, but the sage distribution made by Julien was compiled in 
> an armhf environment (a slightly different architecture). So there 
> were not compatible. 
>
>
> My solution was to get an armhf rootfs from the ubuntu core site 
> (http://cdimage.ubuntu.com/ubuntu-core/releases/12.04/release/), and 
> create a disk image with it to use. 
>
> The procedure to do so would be the following (on a linux box, maybe 
> you would need root privileges to mount the image): 
>
> 1) create an empty file to build the image in. If you just wwant it to 
> use sage, 3GB should be fine. If you want to install a complete ubuntu 
> system, you will need more (i used 7GB): 
> dd -if=/dev/zero of=ubuntu.img -bs=1G count=3 
>
> 2) format the file 
> mkfs.ext2 ubuntu.img 
>
> 3)create a directory and mount the image there 
> mkdir mount 
> mount -o loop ubuntu.img mount 
>
> 4) put the ubuntu core tarball in the directory and unpack it 
> cd mount 
> wget 
> http://cdimage.ubuntu.com/ubuntu-core/releases/12.04/release/ubuntu-core-12.04.1-core-armhf.tar.gz
>  
> tar xzf ubuntu-core-12.04.1-core-armhf.tar.gz 
>
> 5) Unpack the sage install inside the directory 
> 6) Unmount the directory 
> cd .. 
> umount mount 
>
> And that's it, the file ubuntu.img is ready to be used as a chroot 
> environment with a very minimal ubuntu system (not even graphical 
> interface, just the very basic system tools), where sage should work 
> just fine. 
>
> I do have a 7gb image with a lightweight desktop, vnc server, and some 
> applications installed (although for example qt apps don't render 
> well, and firefox and chromium don't work either, so i have replaced 
> them by some alternatives). 
>
> I can try to upload it somewhere, if people is interested. 
>
> On 7 dic, 23:46, jaebond <jacob.ae.b...@gmail.com> wrote: 
> > mmarco, 
> > 
> > I had been working on this exact same issue a few months ago.  Would you 
> > mind explaining what you did to fix your issue? 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > On Friday, December 7, 2012 7:55:55 AM UTC-5, mmarco wrote: 
> > 
> > > Nevermind, i found the problem: i had to use an armhf ubuntu. 
> > 
> > > On 7 dic, 13:15, mmarco <mma...@unizar.es> wrote: 
> > > > I have tried your package in a chroot environment (actually in two, 
> a 
> > > > full ubuntu and a lubuntu), and it doesn't start in neither of them. 
> > 
> > > > Stranegly, the problem seems to be different: in the lubuntu case, 
> it 
> > > > just shows the message with the version and quits. In the full 
> ubuntu, 
> > > > it complains with the message "can't import module sage", but for 
> > > > example, sage -python works fine 
>

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