Dvir,

>From experience:
kernel panic - not syncing: VFS: Unable to mount root fs on uknown-block(8,1)

Means that the hardware (probably your IDE/SATA controller) has not been 
recognized, or the USB isn't supported

Can you try and boot from an image from:
http://www.sysresccd.org/Main_Page

I have a seen their image boot on computers that other flavors were not able 
to

Once you boot - you have 50% of the way to installing - as you know its just a 
hardware driver issue - issue an 'lspci' (command) and see what hardware is 
preset

PS: What ubuntu version are you trying to boot?

On Sunday 15 March 2009 12:19:34 Dvir Volk wrote:
> Hi all,
> I got an lod LG tablet (LT20), and I'm trying to install linux (tried
> ubuntu and fedora) on it.
> The thing is I can't even get the live CD of both installations to even
> boot properly.
> After choosing to install or load the live CD (from the CD's boot menu), I
> get the following kernel panic:
>
> invalid compressed format (err=1)
> kernel panic - not syncing: VFS: Unable to mount root fs on
> uknown-block(8,1)
>
> The machine has a single (working) HDD, and the install is running from
> either a USB DOK or DVD.
>
> Any ideas?


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