GuixSD on T440p won't boot or install properly / missing free software ... nouveau ...

[Kodcu]

Hi, 

I had trouble arriving at the blue screen to install GuixSD with a USB on my 
T440p but then, I burned a DVD and then I could install it with some error 
message but I cannot boot it afterwards. The message was: 
missing free software ... nouveau ... bios ctor failed: -22 unable to locate 
usable image 
but then the installation carried on and it seemed to be successful.

Now I can see grub and then it the logo of Guix with gray background. Then 
nothing else happens.

By the way, during the installation on the blue screen I got another warning: 
your graphics hardware possibly does not work, expect trouble! Perhaps pass 
"nomodeset" to the kernel args and need to configure uvesafb kernel module. I 
am a bit stuck here.

I am passing nomodeset during the boot by pressing e but it has no effect.
Any help?
 Thanks
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