How to monitor Proxmox CPU temp

Seems i cannot go inside the PROXMOX like this
chemi@ubuntuserver:~$ ssh [email protected]
Enter passphrase for key ‘/home/chemi/.ssh/id_rsa’:
hostfile_replace_entries: link /home/chemi/.ssh/known_hosts to /home/chemi/.ssh/known_hosts.old: Operation not permitted
update_known_hosts: hostfile_replace_entries failed for /home/chemi/.ssh/known_hosts: Operation not permitted
Linux proxmox 5.15.64-1-pve #1 SMP PVE 5.15.64-1 (Thu, 13 Oct 2022 10:30:34 +0200) x86_64

What can i do?