Public bug reported:

[Lenovo L420]: System hangs at random spots during 12.04.2 install

Problem:

This machine was previously blocked for certification due to bug
#990110. I downloaded the requested BIOS update from lenovo's site
version: 1.20 and attempting an install via a live iso. While attempting
the install the system would intermittently lose touchpad functionality
and lock up. It will eventually stop responding to all keyboard and
mouse activity and the progress indicator will halt implying the system
has stopped. At this point you cannot switch to an alternate tty.

Reproducible: yes

Image used:
b436b6d4c7de064652f30d783bda5b4e  ubuntu-12.04.2-desktop-amd64.iso

checksum from releases.ubuntu.com:
b436b6d4c7de064652f30d783bda5b4e *ubuntu-12.04.2-desktop-amd64.iso

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1126600

Title:
  [Lenovo L420]: System hangs at random spots during 12.04.2 install

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