oh okay. I actually updated from ubuntu 18.04 to 19.04 in the expectation
that the bug disappears. I do not have enough time now for trying to figure
out this issue due to some academic deadline. But I will follow the steps
as soon as the bug happens again in version 19.04 though. Thank you very
Hello Daniel, thank you for the help. The freezing has just happened again, I
enter tty, used the command ps -A | grep gnome , and I believe that the ID is
the gnome-shell associated to the tty2 because ctrl+alt+f2 is my interface
shortcut. I ran the apport command and with the ID and it give