Thank you Nikos for the feedback! It seems that there is still something wrong (pls see error message at the end of this post) ....
Regards,
Joe
test@ub1804-gsm:~$ sudo dpkg -l "libcanberra-gtk-module*"
[sudo] password for test:
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
un libcanberra-gt <none> <none> (no description available)
test@ub1804-gsm:~$
test@ub1804-gsm:~$ sudo apt-get install libcanberra-gtk-module
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
linux-headers-4.15.0-20 linux-headers-4.15.0-20-generic linux-image-4.15.0-20-generic
linux-modules-4.15.0-20-generic linux-modules-extra-4.15.0-20-generic
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
libcanberra-gtk0
The following NEW packages will be installed:
libcanberra-gtk-module libcanberra-gtk0
0 upgraded, 2 newly installed, 0 to remove and 1 not upgraded.
Need to get 17,9 kB of archives.
After this operation, 84,0 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1
http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 libcanberra-gtk0 amd64 0.30-5ubuntu1 [7.864 B]
Get:2
http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 libcanberra-gtk-module amd64 0.30-5ubuntu1 [10,0 kB]
Fetched 17,9 kB in 0s (58,2 kB/s)
Selecting previously unselected package libcanberra-gtk0:amd64.
(Reading database ... 235610 files and directories currently installed.)
Preparing to unpack .../libcanberra-gtk0_0.30-5ubuntu1_amd64.deb ...
Unpacking libcanberra-gtk0:amd64 (0.30-5ubuntu1) ...
Selecting previously unselected package libcanberra-gtk-module:amd64.
Preparing to unpack .../libcanberra-gtk-module_0.30-5ubuntu1_amd64.deb ...
Unpacking libcanberra-gtk-module:amd64 (0.30-5ubuntu1) ...
Setting up libcanberra-gtk0:amd64 (0.30-5ubuntu1) ...
Setting up libcanberra-gtk-module:amd64 (0.30-5ubuntu1) ...
Processing triggers for libc-bin (2.27-3ubuntu1.4) ...
test@ub1804-gsm:~$ grgsm_livemon -h