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On my Acer Aspire 7720Z laptop, running Ubuntu Lucid Lynx I got the message that the boot folder was full.

Looking around posts, I figured out it contained more files than I needed. So I deleted some, realizing the riskiness only too late.

but, now I get:

[    5.780744] **Kernel panic** - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

(The number between square brackets varies with each attempt.)

The bootable USB, which I then made on my Asus laptop, only resulted in a boot error, at best.

How do I:

  1. get my data out of there ;-)?
  2. get Ubuntu running again, so I can upgrade it to 12.04 LTS?
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