Unable to start Tailscale on Ubuntu 20.04

Tailscale version - 1.36.1

Your operating system & version - Ubuntu 20.04 Focal


On fresh ubuntu install on proxmox LXC, I ran the script

curl -fsSL https://tailscale.com/install.sh | sh

to install Tailscale. Installation itself looks fine without any error. But when I tried to run Tailscale up, I got the following error:

root@ubuntu:~# tailscale up
failed to connect to local tailscaled; it doesn’t appear to be running (sudo systemctl start tailscaled ?)

Tried sudo systemctl start tailscaled command, but running tailscaled again shows the same error. Help?

I have this problem on Raspberry Pi too. I find a reboot makes the problem disapear.