Debian 10

• no namerserver by connman : edit /etc/resolv.conf with nameserver 127.0.0.1
• no sound with errors ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave \\error: No such file or directory : create file /etc/modprobe.d/sound.conf ; insert options snd_hda_intel index=1 ;
• sound clicks at the start of playback : create file /etc/modprobe.d/sound.conf ; insert options snd-hda-intel power_save=0 power_save_controller=N ;

• found on https://debianforum.de/forum/viewtopic.php?p=1251504

• Problem: After an update to thunderbird 78.3.1 the locale language is disabled. I have installed the language package.
• Solution: If you had installed the language package as addon then remove the addon. Now, restart thunderbird and enjoy

It is a bug in the psmouse modul.

• workaround A: load the modul with psmouse proto=ismp

• workaround B: unload and load the module via systemd
• create a scipt /lib/systemd/system-sleep/50psmouse

#!/bin/bash

case "${1}" in
pre)  modprobe -r psmouse 
      ;;
post) modprobe   psmouse
      sleep 2

      #my configuration for the clickpad: very very slow : clickpad key usable, tochpad disabled
      export DISPLAY=:0.0
      TouchID=`xinput | grep -i 'Synaptics' | head -n1 | cut -f2 -d'=' | cut -f1 -d'[' | tr -d '\t '`
      xinput   -set-prop   "${TouchID}"   'Device Accel Constant Deceleration'   '1000.0'   
      ;;
*) exit 0 ;;
esac

• type about:config as URL ; set middlemouse.contentLoadURL=true ; restart firefox with all instances
• better workaround :
  • define a hotkey with a small script

strclip=`xclip -o`
xdotool type --clearmodifiers "${strclip}"