[Bug 1968612] [NEW] Ubuntu 20.04 Cloud Image: NFS Server not working

[T0mCat]

Public bug reported:

I just installed the Ubuntu 20.04 LTS minimal cloud image (from here:
https://cloud-images.ubuntu.com/minimal/releases/focal/release/) in a
Proxmox VM. Then I installed the NFS Server with

apt install nfs-server

But it fails to start with these errors in journalctl:

Apr 10 18:03:55 servername01 systemd[1]: Starting Preprocess NFS configuration...
-- Subject: A start job for unit nfs-config.service has begun execution
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit nfs-config.service has begun execution.
-- 
-- The job identifier is 563.
Apr 10 18:03:55 servername01 mount[9668]: mount: /proc/fs/nfsd: unknown filesystem type 'nfsd'.
Apr 10 18:03:55 servername01 systemd[1]: proc-fs-nfsd.mount: Mount process exited, code=exited, status=32/n/a
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- An n/a= process belonging to unit proc-fs-nfsd.mount has exited.
-- 
-- The process' exit code is 'exited' and its exit status is 32.
Apr 10 18:03:55 servername01 systemd[1]: proc-fs-nfsd.mount: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- The unit proc-fs-nfsd.mount has entered the 'failed' state with result 'exit-code'.
Apr 10 18:03:55 servername01 systemd[1]: Failed to mount NFSD configuration filesystem.
-- Subject: A start job for unit proc-fs-nfsd.mount has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit proc-fs-nfsd.mount has finished with a failure.
-- 
-- The job identifier is 556 and the job result is failed.
Apr 10 18:03:55 servername01 systemd[1]: Dependency failed for NFS Mount Daemon.

"mount: /proc/fs/nfsd: unknown filesystem type 'nfsd'." ... So it seems,
that the nfsd kernel module is missing:

# modprobe nfsd
modprobe: FATAL: Module nfsd not found in directory /lib/modules/5.4.0-1061-kvm

I can't figure out how to install this for the running kernel.

Any idea?

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1968612

Title:
  Ubuntu 20.04 Cloud Image: NFS Server not working

Status in nfs-utils package in Ubuntu:
  New

Bug description:
  I just installed the Ubuntu 20.04 LTS minimal cloud image (from here:
  https://cloud-images.ubuntu.com/minimal/releases/focal/release/) in a
  Proxmox VM. Then I installed the NFS Server with

  apt install nfs-server

  But it fails to start with these errors in journalctl:

  Apr 10 18:03:55 servername01 systemd[1]: Starting Preprocess NFS configuration...
  -- Subject: A start job for unit nfs-config.service has begun execution
  -- Defined-By: systemd
  -- Support: http://www.ubuntu.com/support
  -- 
  -- A start job for unit nfs-config.service has begun execution.
  -- 
  -- The job identifier is 563.
  Apr 10 18:03:55 servername01 mount[9668]: mount: /proc/fs/nfsd: unknown filesystem type 'nfsd'.
  Apr 10 18:03:55 servername01 systemd[1]: proc-fs-nfsd.mount: Mount process exited, code=exited, status=32/n/a
  -- Subject: Unit process exited
  -- Defined-By: systemd
  -- Support: http://www.ubuntu.com/support
  -- 
  -- An n/a= process belonging to unit proc-fs-nfsd.mount has exited.
  -- 
  -- The process' exit code is 'exited' and its exit status is 32.
  Apr 10 18:03:55 servername01 systemd[1]: proc-fs-nfsd.mount: Failed with result 'exit-code'.
  -- Subject: Unit failed
  -- Defined-By: systemd
  -- Support: http://www.ubuntu.com/support
  -- 
  -- The unit proc-fs-nfsd.mount has entered the 'failed' state with result 'exit-code'.
  Apr 10 18:03:55 servername01 systemd[1]: Failed to mount NFSD configuration filesystem.
  -- Subject: A start job for unit proc-fs-nfsd.mount has failed
  -- Defined-By: systemd
  -- Support: http://www.ubuntu.com/support
  -- 
  -- A start job for unit proc-fs-nfsd.mount has finished with a failure.
  -- 
  -- The job identifier is 556 and the job result is failed.
  Apr 10 18:03:55 servername01 systemd[1]: Dependency failed for NFS Mount Daemon.

  "mount: /proc/fs/nfsd: unknown filesystem type 'nfsd'." ... So it
  seems, that the nfsd kernel module is missing:

  # modprobe nfsd
  modprobe: FATAL: Module nfsd not found in directory /lib/modules/5.4.0-1061-kvm

  I can't figure out how to install this for the running kernel.

  Any idea?

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