Timed out waiting for device /sys/devices/virtual/misc/vmbus!hv_kvp (20.04, Hyper-V related?)

I have an ubuntu-20.4 machine. An hour ago I decided to reboot the computer because a simulator was hung and I knew I have to install ubuntu software update(to do it after reboot). So I gave a reboot command sudo shutdown -r now hoping the simlator gracefully being killed(?) could send some message to the license server releasing the simulator license.
Anyway, after the boot, my machine's console has just a blinking cursor at the top left corner. Alt-F2(tty2) and Alt-F3(tty3) work and I can login there. I can even start vnc server and use vnc window from my windows 10 machine as usual. uname -r gives me 5.13.0-35-generic, so I removed quiet splash from the boot command line in /boot/grub/grub.confg for /boot/vmlinuz-5.13.0-35-generic. When I reboot the computer, I see these two lines at the end and no progress.

Timed out waiting for device /sys/devices/virtual/misc/vmbus!hv_kvp
Dependency failed for Hyper-V kVP Protocol Daemon.

What is this problem? and How can I solve this?

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