Aborted Scanning in SimpleScan and later xubuntu freeses

I don't have much information.
- My xubuntu system 18.04 freeses and the last thing I did was aborting scanning while scanning was started some seconds ago. Some time later I could not use SimpleScan anymore and soon it was getting worse.
- The top panel containing my started applications doesn't respond, clicking doesn't help
- Will have to hard reset my system.

TODO:
Type Alt + F2 and type ubuntu-bug nameofprogram. ...
After running one of the above commands, Ubuntu will gather information about the bug. ...
A new web browser tab will open to continue processing the bug data. ...
After logging in to Launchpad, enter a description of the problem in the summary field.

Result:
Alt-F2 and selected SimpleScan in drop down
Nothing happened, no new browser tab with info generated

Then I did : ubuntu-bug -x ===> Don't see extra info

Got message : Extra debug information will be added to the bug report automatically.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xfce4-terminal 0.8.7.4-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Feb 15 11:37:20 2019
ExecutablePath: /usr/bin/xfce4-terminal
InstallationDate: Installed on 2018-04-15 (305 days ago)
InstallationMedia: Xubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
SourcePackage: xfce4-terminal
UpgradeStatus: Upgraded to bionic on 2018-08-02 (196 days ago)