Not sure I report this correctly.
Since updating to 18.04, all chrome extensions capturing the desktop (es. Awesome Screenshot and Screencastify) don't work anymore.
They capture just a black screen.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu3
ProcVersionSignature: Ubuntu 4.14.0-15.18-generic 4.14.12
Uname: Linux 4.14.0-15-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.8-0ubuntu6
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 23 23:27:50 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus: webcamstudio, 0.73, 4.14.0-15-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation HD Graphics 520 [8086:1916] (rev 07) (prog-if 00 [VGA controller])
Subsystem: Lenovo HD Graphics 520 [17aa:5053]
InstallationDate: Installed on 2015-12-07 (778 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 138a:0017 Validity Sensors, Inc. Fingerprint Reader
Bus 001 Device 005: ID 04ca:7058 Lite-On Technology Corp.
Bus 001 Device 002: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 20FMS1G400
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.14.0-15-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
Renderer: Software
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/20/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: R06ET42W (1.16 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FMS1G400
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrR06ET42W(1.16):bd09/20/2016:svnLENOVO:pn20FMS1G400:pvrThinkPadT460:rvnLENOVO:rn20FMS1G400:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T460
dmi.product.name: 20FMS1G400
dmi.product.version: ThinkPad T460
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+18.04.20171116-0ubuntu1
version.libdrm2: libdrm2 2.4.89-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Thu Jan 11 19:43:07 2018
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.5-0ubuntu2
Thanks for your report. This is intended and a security feature of wayland. Meanwhile you can select 'Ubuntu on Xorg' in the logging screen to start xorg instead and screen capture applications should work.