Chromium-Browser not recognizing yubikey u2f anymore?

I'm just having a strange problem, seeing it on two different 18.04 machines. I had been using several u2f tokens, some are just plain u2f tokens (yubikey blue ones and other brands), and Yubikey Neo and Yubikey 4 as well with the chromium browser.

Then I haven't been using the Neo/4 keys for u2f for a while, just the plain ones (different brand), definitely not since 18.04.

Today I wanted to use them and chromium just doesn't recognize them anymore. They are not blinking. Tested with e.g. https://demo.yubico.com/u2f or Google account.

Observations:

- tokens are not damaged: All work with u2f-host

- All work when used with Chromium (maybe not the latest) on Mac OS

- But with Chromium currently distributed with Ubuntu 18.04 it works only with those keys that have u2f only, such as the blue yubikeys and the other brands. Chromium ignores the Yubikey 4 and Neo.

Any idea or hint?

regards

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: chromium-browser 69.0.3497.81-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: XFCE
DRM.card0-DP-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-DP-2:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-HDMI-A-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-HDMI-A-2:
 enabled: enabled
 dpms: On
 status: connected
 edid-base64: AP///////wAMoQBAAQEBAQEWAQOAMx147iVlo1RPoCerUFSlSwDRwIHAAQEBAQEBAQEBAQEBAjqAGHE4LUBYLEUA4A4RAAAeAAAA/ABBSU8gUEMgICAgICAAAAAA/QA7PR5EDwAKICAgICAgAAAA/wAwMDAwMDEKICAgICAgAF4=
 modes: 1920x1080 1280x1024 1280x720 1024x768 1024x768 800x600 800x600 640x480 640x480 720x400
DRM.card0-VGA-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
Date: Mon Oct 8 20:47:15 2018
Desktop-Session:
 'xubuntu'
 '/etc/xdg/xdg-xubuntu:/etc/xdg:/etc/xdg'
 '/usr/share/xubuntu:/usr/share/xfce4:/usr/local/share:/usr/share:/var/lib/snapd/desktop:/usr/share'
DetectedPlugins:

Env:
 'None'
 'None'
InstallationDate: Installed on 2018-06-09 (121 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
InstalledPlugins:

Load-Avg-1min: 0.34
Load-Processes-Running-Percent: 0.3%
MachineType: Medion G24
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-36-generic root=UUID=a3f06afa-8405-4064-8044-0a9e1b4c19c8 ro quiet splash vt.handoff=1
SourcePackage: chromium-browser
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/12/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: H61TIW08.111
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H61H2-TI2
dmi.board.vendor: Medion
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Medion
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrH61TIW08.111:bd10/12/2012:svnMedion:pnG24:pvr1.0:rvnMedion:rnH61H2-TI2:rvr1.0:cvnMedion:ct3:cvr1.0:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: G24
dmi.product.version: 1.0
dmi.sys.vendor: Medion
modified.conffile..etc.default.chromium-browser: [deleted]