Lab3.2 unable to start unprivileged-cont-user container

Hi,

I followed by the book the lab but I have this error :

student@ubuntu:~$ lxc-start -n unpriv-cont-user -F
systemd 245.4-4ubuntu3.24 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid)
Detected virtualization lxc.
Detected architecture x86-64.

Welcome to Ubuntu 20.04.6 LTS!

Set hostname to .
Initializing machine ID from random generator.
Failed to create /init.scope control group: Permission denied
Failed to allocate manager object: Permission denied
[!!!!!!] Failed to allocate manager object.
Exiting PID 1...

Any idea would be helpful!

Regards