我正在尝试让 nfs 在 Ubuntu 16.04.2 LTS 上运行。我收到以下错误：
我已经尝试按照其他论坛提供的说明重新安装 nfs-common、nfs-kernel-server 和其他软件包，但无法正常工作。由于这个原因，通过 dpkg 安装每次都会失败。
May 17 11:32:44 ocrservernew systemd[1]: Mounting RPC Pipe File System...
May 17 11:32:44 ocrservernew systemd[1]: Mounting NFSD configuration filesystem...
May 17 11:32:44 ocrservernew mount[1962]: mount: unknown filesystem type 'rpc_pipefs'
May 17 11:32:44 ocrservernew systemd[1]: run-rpc_pipefs.mount: Mount process exited, code=exi
May 17 11:32:44 ocrservernew systemd[1]: Failed to mount RPC Pipe File System.
May 17 11:32:44 ocrservernew systemd[1]: Dependency failed for RPC security service for NFS c
May 17 11:32:44 ocrservernew mount[1963]: mount: unknown filesystem type 'nfsd'
May 17 11:32:44 ocrservernew systemd[1]: rpc-gssd.service: Job rpc-gssd.service/start failed
May 17 11:32:44 ocrservernew systemd[1]: Dependency failed for RPC security service for NFS s
May 17 11:32:44 ocrservernew systemd[1]: rpc-svcgssd.service: Job rpc-svcgssd.service/start f
May 17 11:32:44 ocrservernew systemd[1]: Dependency failed for NFSv4 ID-name mapping service.
May 17 11:32:44 ocrservernew systemd[1]: nfs-idmapd.service: Job nfs-idmapd.service/start fai
May 17 11:32:44 ocrservernew systemd[1]: run-rpc_pipefs.mount: Unit entered failed state.
May 17 11:32:44 ocrservernew systemd[1]: proc-fs-nfsd.mount: Mount process exited, code=exite
May 17 11:32:44 ocrservernew systemd[1]: Failed to mount NFSD configuration filesystem.
May 17 11:32:44 ocrservernew systemd[1]: Dependency failed for NFS server and services.
May 17 11:32:44 ocrservernew systemd[1]: Dependency failed for NFS Mount Daemon.
May 17 11:32:44 ocrservernew systemd[1]: nfs-mountd.service: Job nfs-mountd.service/start fai
May 17 11:32:44 ocrservernew systemd[1]: nfs-server.service: Job nfs-server.service/start fai
May 17 11:32:44 ocrservernew systemd[1]: proc-fs-nfsd.mount: Unit entered failed state.
May 17 11:32:44 ocrservernew sudo[1959]: pam_unix(sudo:session): session closed for user root
知道可能出了什么问题吗？