In some cases, your memory may be limited to 1GB. This is caused by the hotplug driver for memory in the virtualization not being recognized. To resolve this. For any VM make sure qemu-guest-agent is installed. For Linux, make sure to read https://pve.proxmox.com/wiki/Hotplug_(qemu_disk,nic,cpu,memory)#Linux_Guests_Notes In most cases it's enough to add the file: /lib/udev/rules.d/80-hotplug-cpu-mem.rules Add this content to the file: SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", ATTR{online}="1" SUBSYSTEM=="memory", ACTION=="add", TEST=="state", ATTR{state}=="offline", ATTR{state}="online" Reboot the VM and see if it works. If you cant take any of these steps, contact us and we'll disable hotplug for your VM. (Some VM OS flavours might not support hotplug.)