Cgroup mount problem

Hi All,
I hope some one could help me with this error.

When trying to install ox app suite I get this error:
Installation of multiple apps
We tried to do as requested but failed for ox-connector on mail.7verlichtingen.nl, oxseforucs on mail.7verlichtingen.nl
These are the error messages from the server. More information might be available on the system’s logfile /var/log/univention/appcenter.log

r-app-ox-connector[12924]: Starting ox-connector Container f24242156917f140f4991f5930272b17e71b8220854d16da8acde2e66dd297b2 ...Error response from daemon: Cannot restart container f24242156917f140f4991f5930272b17e71b8220854d16da8acde2e66dd297b2: cgroups: cgroup mountpoint does not exist: unknown Dec 26 19:28:45 mail systemd[1]: docker-app-ox-connector.service: Control process exited, code=exited, status=1/FAILURE Dec 26 19:28:45 mail systemd[1]: docker-app-ox-connector.service: Failed with result 'exit-code'. Dec 26 19:28:45 mail systemd[1]: Failed to start LSB: Start the Container for ox-connector. Dec 26 19:28:45 mail systemd[1]: docker-app-ox-connector.service: Consumed 887ms CPU time.
Automatically added App ox-connector=2.2.7 has its own settings. You should explicitely mention this App. This way, you may (or may not) set settings for this App via --set.
Unable to install. Aborting...

Looking in: /var/log/univention/appcenter.log
I can see what the problem is.
The error is: 23-12-26 19:28:46 [CRITICAL]: r-app-ox-connector[12924]: Starting ox-connector Container xxxxxxx Error response from daemon: Cannot restart container xxxxxxx: cgroups: cgroup mountpoint does not exist: unknown

I am running UCS 5.06.
When running diagnostics I don’t get any errors.
Univention is updated to the the latest version.

I am running Univention in a lxc container on Proxmox 8.1.3

With my first setup I have downloaded the original lxc container version 5.02 from the Univention website.
Same error, mouting problem.
When trying to mount the cgroup folder I get permission denied error.

The same is also with my second setup. I used the Proxmox Debian 9 lxc container and could do a clean install of Univention by adding the repository’s to that container and from there on install all the Univention files.

My Proxmox conf file is:
arch: amd64
cores: 6
features: fuse=1,mknod=1,mount=nfs;cifs,nesting=1
hostname: subdomain.domainname.tld
memory: 4096
nameserver: 10.10.10.211
net0: name=eth0,bridge=vmbr0,firewall=1,gw=10.10.10.1,hwaddr=BC:24:11:4E:0A:6D,ip=10.10.10.211/24,type=veth
ostype: debian
rootfs: local:209/vm-209-disk-1.raw,size=20G
searchdomain: subdomain.domainname.tld
swap: 512
lxc.cgroup.devices.allow: a
lxc.cap.drop:
lxc.cgroup.devices.deny:
lxc.cgroup.devices.allow:
lxc.apparmor.profile: unconfined

I also have a third setup and that is I installed Univention from the official iso file that I downloaded from there website.
Everything works fine with that setup

With kind regards,

Charles

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