installation failure xfce4-timer-plugin

Hi,

as a newbie in this forum, I see a lot about HW, but almost nothing about OS Versions? Puzzled, where to place, I try to do this here:

After installing Debian Buster & XFCE on an OPI-Zero, I'm getting frquently installation errors. Its always

dpkg: unrecoverable fatal error, aborting:
 files list file for package 'xfce4-timer-plugin' is missing final newline
E: Sub-process /usr/bin/dpkg returned an error code (2)

 like this one:

     ┌────────────────────────────────────────────────────────────────────┐
     │                         • MobaXterm 9.4 •                          │
     │            (SSH client, X-server and networking tools)             │
     │                                                                    │
     │ ➤ SSH session to hk@192.168.1.19                                   │
     │   • SSH compression : ✔                                            │
     │   • SSH-browser     : ✔                                            │
     │   • X11-forwarding  : ✔  (remote display is forwarded through SSH) │
     │   • DISPLAY         : ✔  (automatically set on remote server)      │
     │                                                                    │
     │ ➤ For more info, ctrl+click on help or visit our website           │
     └────────────────────────────────────────────────────────────────────┘

  ___  ____  _   _____
 / _ \|  _ \(_) |__  /___ _ __ ___
| | | | |_) | |   / // _ \ '__/ _ \
| |_| |  __/| |  / /|  __/ | | (_) |
 \___/|_|   |_| /____\___|_|  \___/

Welcome to Armbian Buster with Linux 5.3.9-sunxi

System load:   1.90 1.10 0.43   Up time:       1 min
Memory usage:  16 % of 491MB    IP:            192.168.1.19
CPU temp:      51°C
Usage of /:    2% of 122G

...

root@orangepizero:~# apt-get install firefox-esr-l10n-de
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  firefox-esr libevent-2.1-6 libjsoncpp1 libvpx5
Suggested packages:
  fonts-stix | otf-stix fonts-lmodern libcanberra0 pulseaudio
Recommended packages:
  libavcodec58 | libavcodec-extra58 | libavcodec57 | libavcodec-extra57 | libavcodec56 | libavcodec-extra56 | libavcodec55 | libavcodec-extra55 | libavcodec54 | libavcodec-extra54 | libavcodec53
  | libavcodec-extra53 hunspell-de-de | hunspell-de-at | hunspell-de-ch
The following NEW packages will be installed:
  firefox-esr firefox-esr-l10n-de libevent-2.1-6 libjsoncpp1 libvpx5
0 upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/44.1 MB of archives.
After this operation, 145 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Selecting previously unselected package libevent-2.1-6:armhf.
dpkg: unrecoverable fatal error, aborting:
 files list file for package 'xfce4-timer-plugin' is missing final newline
E: Sub-process /usr/bin/dpkg returned an error code (2)
root@orangepizero:~#

In case that I am in the wrong Forum, please advice, where to go.

Thank you

hk