Ubuntu 11.10 recovery menu gives errors: USB disconnect with USB keyboard

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http://askubuntu.com – I have Ubuntu 11.10. I recently tried to install fglrx-updates video driver but system hanged during installation, so I ended up with the system which will not boot up. I tried to load to recovery mode, but when Recovery Menu (limited read-only menu) loads something happens and I got messages over the menu saying: [ 3.079107] usb 2-1.2: new low speed USB device number 4 using ehci_hcd [ 3.151074] usb 2-1.2: device descriptor read/64, error -32 ... ... device not accepting address 5, error -32 unable to enumerate device on port 2 ... when I (HowTos)