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[Vyacheslav <slavoon2@xxxxxxxxx>]

also found this bug after installing (at the middle of June 2014) fresh copy of ubuntu-14.04-beta2-server-amd64.iso AND NOTHING ELSE! (no KDE, Gnome etc.) predominantly arbitrarily keys presses digit '1', digit '2', digit '3', left and right arrows and Enter. My Ubuntu is installed at sda7 of hard disk, sda1 is partition for Win XP (then I boot in Windows, no any bugs with keyboard!), grub installed into sda Master Block Record), I selected Russian language before installin server, and updates are downloading during install, software sources enabled: main, universe, restricted, multiverse, download server is Main server (not local for Russian Federation), other software sources: Canonical partners, Canonical partners (source code), Independent, Independent (source code), Important security updates, Recommended updates, Pre-released updates, Unsupported updates, Release upgrade: long term support releases only.
my configuration is Asus P5G41T-M LX motherboard (northbridge Intel G41, southbridge Intel ICH7) with Pentium Dual-core CPU E5700 @ 3.00 GHz, 4 Gb dual-channel memory. Removing the keyboard physically from PS/2 socket does not solve the problem.
Also I installed fresh copy of ubuntu-14.04-beta2-server-amd64.iso and selected English and also found this bug (after KDE (kubuntu-desktop package) installed or before I install KDE, I don't remember), also found this bug after installing fresh copy of ubuntu-12.04.4-server-amd64.iso (with Russian selected) and kubuntu-desktop package (I am not sure if this bug will not appear after installing fresh copy of ubuntu-12.04.4-server-amd64.iso without KDE), but in 12.04.4 this bug appears more rarely then in 14.04. This bug appears more often when I use RealVNC or TeamViewer and remotely control my computer (in KDE enviromnent).

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https://bugs.launchpad.net/bugs/124406

Title:
  Keyboard keys get stuck and repeat

Status in GNU Emacs:
  Invalid
Status in The Linux Kernel:
  Confirmed
Status in X.Org X server:
  In Progress
Status in “linux” package in Ubuntu:
  Won't Fix
Status in “xorg-server” package in Ubuntu:
  Won't Fix
Status in “linux” source package in Jaunty:
  Won't Fix
Status in “xorg-server” source package in Jaunty:
  Invalid
Status in Gentoo Linux:
  New

Bug description:
  Keyboard keys such as the arrows, Alt-F4, PageUp/PageDown, etc. often
  get 'stuck' and continue being 'clicked' even after they are
  physically released. For example when clicking Alt-F4, sometimes it
  gets stuck so all the windows are closed instead of just one.

  My configuration is Feisty + Xgl + Compiz Fusion. My previous
  configuration was Edgy + Xgl + Beryl, where this didn't happen. Others
  have reported the same problem without using either Xgl or Compiz.

  The keyboard itself isn't the problem. When dual-booting to Windows,
  everything works fine. Also, the problem happens with two different
  keyboards (internal laptop, external USB).

  My best guess is that the problem occurs at time of high system load.
  Somehow during these times the key-release signal gets lost and the
  key-press is repeated indefinitely. This happens more often with
  Compiz configurations because Compiz tends to increase system load. It
  also happens more often with power-hungry apps like Firefox and
  Acrobat Reader for similar reasons.

  PS: When the keys would repeat all input devices would be locked up.
  ie. mouse won't move, clicks don't do anything, keyboard presses don't
  register. Then when it becomes unstuck, the mouse moves around and
  everything. Hope this helps.

  See also this forum thread for other people with the same problem:
  http://ubuntuforums.org/showthread.php?t=432057

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