root@proxmox:/mnt# cat /proc/9990/uid_map
         0     100000        107
       107        110          1
       108     100108      64530
root@proxmox:/mnt# lxc-start -F -n 102
lxc-start: 102: conf.c: lxc_setup_boot_id: 3527 Permission denied - Failed to mount /dev/.lxc-boot-id to /proc/sys/kernel/random/boot_id
                                 systemd 241 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 Debian GNU/Linux 10 (buster)!

Set hostname to <plex>.
File /lib/systemd/system/systemd-journald.service:12 configures an IP firewall (IPAddressDeny=any), but the local system does not support BPF/cgroup based firewalling.
Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.)
[  OK  ] Started Forward Password Requests to Wall Directory Watch.
[  OK  ] Listening on udev Control Socket.
systemd-journald-audit.socket: Failed to create listening socket (audit 1): Operation not permitted
systemd-journald-audit.socket: Failed to listen on sockets: Operation not permitted
systemd-journald-audit.socket: Failed with result 'resources'.
[FAILED] Failed to listen on Journal Audit Socket.
See 'systemctl status systemd-journald-audit.socket' for details.
[  OK  ] Created slice system-container\x2dgetty.slice.
[  OK  ] Created slice system-postfix.slice.
[  OK  ] Reached target Remote File Systems.
[  OK  ] Listening on Journal Socket (/dev/log).
[  OK  ] Listening on Journal Socket.
sys-kernel-debug.mount: Failed to check directory /sys/kernel/debug: Permission denied
         Mounting Kernel Debug File System...
         Starting Remount Root and Kernel File Systems...
         Mounting POSIX Message Queue File System...
[  OK  ] Created slice User and Session Slice.
[  OK  ] Reached target Slices.
         Starting Load Kernel Modules...
[  OK  ] Started Dispatch Password Requests to Console Directory Watch.
[  OK  ] Reached target Paths.
[  OK  ] Reached target Local Encrypted Volumes.
[  OK  ] Listening on udev Kernel Socket.
         Starting udev Coldplug all Devices...
[  OK  ] Listening on initctl Compatibility Named Pipe.
[  OK  ] Reached target Swap.
[  OK  ] Listening on Syslog Socket.
         Starting Journal Service...
sys-kernel-debug.mount: Mount process exited, code=exited, status=32/n/a
sys-kernel-debug.mount: Failed with result 'exit-code'.
[FAILED] Failed to mount Kernel Debug File System.
See 'systemctl status sys-kernel-debug.mount' for details.
[  OK  ] Started Remount Root and Kernel File Systems.
[  OK  ] Mounted POSIX Message Queue File System.
         Starting Create System Users...
[  OK  ] Started Load Kernel Modules.
         Starting Apply Kernel Variables...
         Mounting Kernel Configuration File System...
sys-kernel-config.mount: Mount process exited, code=exited, status=32/n/a
sys-kernel-config.mount: Failed with result 'exit-code'.
[FAILED] Failed to mount Kernel Configuration File System.
See 'systemctl status sys-kernel-config.mount' for details.
[  OK  ] Started Apply Kernel Variables.
[  OK  ] Started Journal Service.
         Starting Flush Journal to Persistent Storage...
[  OK  ] Started Create System Users.
         Starting Create Static Device Nodes in /dev...
[  OK  ] Started Create Static Device Nodes in /dev.
         Starting udev Kernel Device Manager...
[  OK  ] Reached target Local File Systems (Pre).
[  OK  ] Reached target Local File Systems.
[  OK  ] Started Flush Journal to Persistent Storage.
         Starting Create Volatile Files and Directories...
[  OK  ] Started udev Kernel Device Manager.
[  OK  ] Started Create Volatile Files and Directories.
[  OK  ] Reached target System Time Synchronized.
         Starting Update UTMP about System Boot/Shutdown...
[  OK  ] Started Update UTMP about System Boot/Shutdown.
[  OK  ] Started udev Coldplug all Devices.
         Starting Helper to synchronize boot up for ifupdown...
[  OK  ] Reached target System Initialization.
[  OK  ] Started Daily rotation of log files.
[  OK  ] Started Daily apt download activities.
[  OK  ] Started Daily apt upgrade and clean activities.
[  OK  ] Listening on D-Bus System Message Bus Socket.
[  OK  ] Reached target Sockets.
[  OK  ] Reached target Basic System.
         Starting System Logging Service...
[  OK  ] Started Regular background program processing daemon.
         Starting Login Service...
[  OK  ] Started D-Bus System Message Bus.
[  OK  ] Started Daily Cleanup of Temporary Directories.
[  OK  ] Started Daily man-db regeneration.
[  OK  ] Reached target Timers.
[  OK  ] Started System Logging Service.
[  OK  ] Started Helper to synchronize boot up for ifupdown.
[  OK  ] Started Login Service.
         Starting Raise network interfaces...
[  OK  ] Started Raise network interfaces.
[  OK  ] Reached target Network.
[  OK  ] Reached target Network is Online.
         Starting Postfix Mail Transport Agent (instance -)...
         Starting Plex Media Server...
         Starting Permit User Sessions...
         Starting OpenBSD Secure Shell server...
[  OK  ] Started Permit User Sessions.
[  OK  ] Started Container Getty on /dev/tty2.
[  OK  ] Started Container Getty on /dev/tty1.
[  OK  ] Started Console Getty.
[  OK  ] Reached target Login Prompts.
[  OK  ] Started Plex Media Server.
[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Started Postfix Mail Transport Agent (instance -).
         Starting Postfix Mail Transport Agent...
[  OK  ] Started Postfix Mail Transport Agent.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.