Public bug reported:

the problem seems to be related to xorg

Symptomes: no key works in xorg but the device 
/dev/input/event2 is there and works according to evtest

The keyboard works during startup and in the text consoles.

"solution": I am now using a second usb keyboard 
(/dev/input/event4 on my machine)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu6
ProcVersionSignature: Ubuntu 4.10.0-42.46~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CompizPlugins: No value set for 
CompositorRunning: None
CurrentDesktop: GNOME
Date: Sat Apr  7 12:48:36 2018
DistUpgraded: 2018-04-07 09:51:42,601 ERROR got error from PostInstallScript 
./ (g-exec-error-quark: Kindprozess 
»./« konnte nicht ausgeführt werden (No such file or 
directory) (8))
DistroCodename: bionic
DistroVariant: ubuntu
 virtualbox, 5.2.8, 4.10.0-42-generic, x86_64: installed
 virtualbox, 5.2.8, 4.15.0-13-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company 2nd Generation Core Processor Family 
Integrated Graphics Controller [103c:1494]
InstallationDate: Installed on 2017-12-27 (100 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
MachineType: Hewlett-Packard HP Compaq 8200 Elite CMT PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-42-generic 
root=UUID=aabc1b46-62b2-4910-870e-ff827d8783dd ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to bionic on 2018-04-07 (0 days ago) 11/10/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: J01 v02.15
dmi.board.asset.tag: CZC2250RZC 1494
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC2250RZC
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi:bvnHewlett-Packard:bvrJ01v02.15:bd11/10/2011:svnHewlett-Packard:pnHPCompaq8200EliteCMTPC:pvr:rvnHewlett-Packard:rn1494:rvr:cvnHewlett-Packard:ct6:cvr: HP Compaq 8200 Elite CMT PC
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Sat Apr  7 12:35:27 2018
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.6-1ubuntu3
xserver.video_driver: modeset

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic ubuntu

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  ps2 keyboard not working after upgrade 16.04 -> 18.04

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