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I start from gnome-shell to run the following command

tmux new -s "main"
alacritty &

Then run commands on the new shell of alacritty

pkill -9 terminal #to kill the gnome-shell terminal 

At the moment, pstree to review the current process

me@host:~:
$ ps -ef | grep shell
me    2986  2831  4 12:08 tty2     00:00:06 /usr/bin/gnome-shell
me    3049  2745  0 12:08 ?        00:00:00 /usr/lib/gnome-shell/gnome-shell-calendar-server
me    4073  4020  0 12:10 pts/2    00:00:00 grep --color=auto shell
me@host:~:
$ pstree -asp 2986
systemd,1 splash
  └─gdm3,1710
      └─gdm-session-wor,2695
          └─gdm-x-session,2816 --run-script...
              └─gnome-session-b,2831 --session=ubuntu
                  └─gnome-shell,2986
                      ├─ibus-daemon,3020 --xim --panel disable
                      │   ├─ibus-dconf,3024
                      │   │   ├─{ibus-dconf},3027
                      │   │   ├─{ibus-dconf},3028
                      │   │   └─{ibus-dconf},3043
                      │   ├─ibus-engine-sim,3401
                      │   │   ├─{ibus-engine-sim},3402
                      │   │   └─{ibus-engine-sim},3403
                      │   ├─ibus-extension-,3025
                      │   │   ├─{ibus-extension-},3035
                      │   │   ├─{ibus-extension-},3036
                      │   │   └─{ibus-extension-},3047
                      │   ├─{ibus-daemon},3021
                      │   └─{ibus-daemon},3022
                      ├─{gnome-shell},2988
                      ├─{gnome-shell},2990
                      ├─{gnome-shell},2991
                      ├─{gnome-shell},2992
                      ├─{gnome-shell},3007
                      ├─{gnome-shell},3014
                      ├─{gnome-shell},3015
                      ├─{gnome-shell},3016
                      └─{gnome-shell},3017

Why are there still so many gnome-shell running?

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