MultiUserOnUbuntu2204

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Steps

Change hostname and print system info:

# hostnamectl set-hostname multiubuntu
# exit
logout
Connection to 192.168.1.52 closed.
$ ssh root@192.168.1.52
root@multiubuntu:~# uname -a
Linux multiubuntu 5.15.0-117-generic #127-Ubuntu SMP Fri Jul 5 20:13:28 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
root@multiubuntu:~# cat /etc/issue
Ubuntu 22.04.4 LTS \n \l

Install xfce4(Using xfce4 for demo):

# apt install -y xfce4

Create 10 test users, change shell, change passwd:

$ for i in {1..10}; do useradd -m test$i; done
$ sudo ls /home
test  test1  test10  test2  test3  test4  test5  test6  test7  test8  test9
$ for i in {1..10}; do chsh -s /bin/bash test$i; done
$ vim bulkpasswords
$ chpasswd < bulkpasswords 

Define every user’s .xinitrc:

# cp /etc/X11/xinit/xinitrc .
# vim xinitrc
    ......
    # invoke global X session script
    #. /etc/X11/Xsession
    XDG_SESSION_TYPE=x11
    exec dbus-run-session -- startxfce4
# for i in {1..10}; do  cp xinitrc /home/test$i/.xinitrc; done

Change the available ttys:

# vim /etc/systemd/logind.conf
[Login]
NAutoVTs=50
ReserveVT=50

Change the bash profile for each user:

# cat bash_profile_example
#
# ~/.bash_profile
#

[[ -f ~/.bashrc ]] && . ~/.bashrc
if [ -z "$DISPLAY" ] && [ "$XDG_VTNR" = TOBEREPLACED ]; then
  exec startx &>/dev/null
fi
# for i in {1..10}; do cp /root/bash_profile_example /home/test$i/.bash_profile; sed -i "s/TOBEREPLACED/$i/g" /home/test$i/.bash_profile; chown -R test$i /home/test$i/.bash_profile; done

Add all user to autologin:

# groupadd -r autologin
# for i in {1..10}; do gpasswd -a test$i autologin; done

autologin template file:

[Service]
Type=simple
ExecStart=
Environment=XDG_SESSION_TYPE=x11
ExecStart=-/usr/sbin/agetty --skip-login --nonewline --noissue --autologin TOBEREPLACED --noclear %I $TERM

Add autologin service:

root@multi:~# cat autologin.conf 
[Service]
Type=simple
ExecStart=
ExecStart=-/usr/bin/agetty --skip-login --nonewline --noissue --autologin TOBEREPLACED --noclear %I $TERM
# for i in {1..50}; do mkdir -p /etc/systemd/system/getty\@tty$i.service.d/; done
for i in {1..50}; do cp autologin.conf /etc/systemd/system/getty\@tty$i.service.d/; sed -i "s/TOBEREPLACED/test$i/g" /etc/systemd/system/getty\@tty$i.service.d/autologin.conf; done

Now add autologin crontab:

# crontab -e
@reboot sleep 10 && /usr/bin/chvtsh.sh

Create chvtsh.sh:

#!/bin/bash
while ! ps -p $(pgrep Xorg) > /dev/null; do
  echo "Waiting for xorg to start...">>/tmp/waitdone.txt
  sleep 1
done
echo "xorg started, switching to console 2">>/tmp/waitdone.txt
sleep 5
for i in {2..50}
do
	chvt $i
	systemctl start getty@tty$i
	sleep 5
done

Enable the getty@tty1:

# systemctl set-default multi-user.target
# systemctl enable getty@tty1