Hello, had a similar issue. Two things are needed to get it working: 1) Install "gnome-tweaks", start it and enable the "Ubuntu appindicators" extension. 2) Edit the file ~/.config/autostart/Flameshot.desktop and replace the "Exec" line to delay the startup a litte:
[Desktop Entry] Name=flameshot Icon=flameshot #Exec=flameshot Exec=bash -c "sleep 10 && flameshot" Terminal=false Type=Application StartupNotify=false Good luck!
