Same issue here. Dell r210ii with an E3-1220v1 and 8gb of ram.
proxmox-ve: 6.1-2 (running kernel: 5.3.18-3-pve)
pve-manager: 6.1-8 (running version: 6.1-8/806edfe1)
pve-kernel-helper: 6.1-8
pve-kernel-5.3: 6.1-6
pve-kernel-5.3.18-3-pve: 5.3.18-3
pve-kernel-5.3.18-2-pve: 5.3.18-2
ceph-fuse: 12.2.11+dfsg1-2.1+b1
corosync: 3.0.3-pve1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: residual config
ifupdown2: 2.0.1-1+pve8
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.15-pve1
libpve-access-control: 6.0-6
libpve-apiclient-perl: 3.0-3
libpve-common-perl: 6.0-17
libpve-guest-common-perl: 3.0-5
libpve-http-server-perl: 3.0-5
libpve-storage-perl: 6.1-5
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 3.2.1-1
lxcfs: 4.0.1-pve1
novnc-pve: 1.1.0-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.1-3
pve-cluster: 6.1-4
pve-container: 3.0-23
pve-docs: 6.1-6
pve-edk2-firmware: 2.20200229-1
pve-firewall: 4.0-10
pve-firmware: 3.0-7
pve-ha-manager: 3.0-9
pve-i18n: 2.0-4
pve-qemu-kvm: 4.1.1-4
pve-xtermjs: 4.3.0-1
qemu-server: 6.1-7
smartmontools: 7.1-pve2
spiceterm: 3.1-1
vncterm: 1.6-1
zfsutils-linux: 0.8.3-pve1
bios: ovmf
bootdisk: scsi0
cores: 1
ide2: local:iso/ubuntu-20.04-live-server-amd64.iso,media=cdrom
memory: 512
net0: virtio=EA:55:75:FA:22:45,bridge=vmbr0,firewall=1
numa: 0
ostype: l26
scsi0: local-zfs:vm-102-disk-0,size=32G
scsihw: virtio-scsi-pci
smbios1: uuid=92a10a54-4825-444c-a9ce-dbb015de746b
sockets: 1
vmgenid: 903e1461-bb6d-4790-9961-d6088b52129f
root@cloudctl1:~# qm config 102
bootdisk: scsi0
cores: 1
ide2: local:iso/ubuntu-20.04-live-server-amd64.iso,media=cdrom
memory: 512
net0: virtio=EA:55:75:FA:22:45,bridge=vmbr0,firewall=1
numa: 0
ostype: l26
scsi0: local-zfs:vm-102-disk-0,size=32G
scsihw: virtio-scsi-pci
smbios1: uuid=92a10a54-4825-444c-a9ce-dbb015de746b
sockets: 1
vmgenid: 903e1461-bb6d-4790-9961-d6088b52129f