我刚刚安装了 Ubuntu 20.04 云映像（来自这里：https://cloud-images.ubuntu.com/minimal/releases/focal/release/) 在 Proxmox VM 中。然后我安装了 NFS 服务器
apt install nfs-server
但它无法启动，并且 journalctl 中出现以下错误：
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: 未知的文件系统类型‘nfsd’。”...看来，缺少了 nfsd 内核模块：
# modprobe nfsd
modprobe: FATAL: Module nfsd not found in directory /lib/modules/5.4.0-1061-kvm
我不知道如何为正在运行的内核安装它
# uname -a
Linux kubix-cnt01 5.4.0-1061-kvm #64-Ubuntu SMP Thu Mar 24 20:55:55 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
任何想法？
提前谢谢
T0mc @
答案1
我发现您在 Launchpad 上发现了一个错误：https://bugs.launchpad.net/ubuntu/+source/linux-meta-kvm/+bug/1968612
TL;DR linux-kvm（在最小云映像中安装的默认内核）不附带 nfsd.ko 模块，因此会破坏nfs-server安装。
作为一种解决方法，用户可以安装不同的内核版本（如linux-generic）或直接选择完整的服务器映像云图片（ubuntu-20.04-server-cloudimg-amd64.img）。