After upgrade, NFS modules stopped loading into kernel, /proc/fs/nfsd stopped being mounted.
Using modprobe to load the NFS modules successfully installs, but when attempting to mount -t nfsd /proc/fs/nfsd, it complains about not being in the /etc/fstab. Since nfsd isn't mounted, all the other NFS services fail.
This is what systemd reports:
May 10 04:46:49 Cuckoo-Database systemd[1]: nfs-idmapd.service: Job nfs-idmapd.service/start failed with result 'dependency'.May 10 04:46:49 Cuckoo-Database systemd[1]: Dependency failed for NFS Mount Daemon.-- Subject: A start job for unit nfs-mountd.service has failed-- Defined-By: systemd-- Support: http://www.ubuntu.com/support-- -- A start job for unit nfs-mountd.service has finished with a failure.-- -- The job identifier is 984 and the job result is dependency.May 10 04:46:49 Cuckoo-Database systemd[1]: nfs-mountd.service: Job nfs-mountd.service/start failed with result 'dependency'.May 10 04:46:49 Cuckoo-Database systemd[1]: nfs-server.service: Job nfs-server.service/start failed with result 'dependency'.May 10 04:46:49 Cuckoo-Database systemd[1]: nfs-idmapd.service: Unit is bound to inactive unit nfs-server.service. Stopping, too.May 10 04:46:49 Cuckoo-Database systemd[1]: Stopping NFSv4 ID-name mapping service...I attempted to reinstall nfs-common and nfs-kernel-server, but this didn't solve the issue.