我正在开发一个需要 nfs-kernel-server 的项目，昨天更新后，nfs-kernel-server 将无法启动。卸载/重新安装后，它在安装时崩溃，并显示：
A dependency job for nfs-server.service failed. See 'journalctl -xe' for details.
invoke-rc.d: initscript nfs-kernel-server, action "start" failed.
● nfs-server.service - NFS server and services
Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
Active: inactive (dead)
Feb 02 16:07:49 Bone0 systemd[1]: Dependency failed for NFS server and services.
Feb 02 16:07:49 Bone0 systemd[1]: nfs-server.service: Job nfs-server.service/start failed with result 'dependency'.
Feb 02 16:07:58 Bone0 systemd[1]: Dependency failed for NFS server and services.
Feb 02 16:07:58 Bone0 systemd[1]: nfs-server.service: Job nfs-server.service/start failed with result 'dependency'.
Failed to start nfs-kernel-server, ignoring.
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for systemd (237-3ubuntu10.11) ...
我该怎么做才能让事情重新运转起来？
-- The start-up result is RESULT.
Feb 02 17:57:32 Bone0 systemd[4180]: Listening on GnuPG cryptographic agent and passphrase cache (restricted).
-- Subject: Unit UNIT has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit UNIT has finished starting up.
--
-- The start-up result is RESULT.
Feb 02 17:57:32 Bone0 systemd[4180]: Listening on GnuPG cryptographic agent and passphrase cache.
-- Subject: Unit UNIT has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit UNIT has finished starting up.
--
-- The start-up result is RESULT.
Feb 02 17:57:32 Bone0 systemd[4180]: Reached target Sockets.
-- Subject: Unit UNIT has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit UNIT has finished starting up.
--
-- The start-up result is RESULT.
Feb 02 17:57:32 Bone0 systemd[4180]: Reached target Basic System.
-- Subject: Unit UNIT has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit UNIT has finished starting up.
--
-- The start-up result is RESULT.
Feb 02 17:57:32 Bone0 systemd[4180]: Reached target Default.
-- Subject: Unit UNIT has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit UNIT has finished starting up.
--
-- The start-up result is RESULT.
Feb 02 17:57:32 Bone0 systemd[4180]: Startup finished in 217ms.
-- Subject: User manager start-up is now complete
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The user manager instance for user 1001 has been started. All services queued
-- for starting have been started. Note that other services might still be starting
-- up or be started at any later time.
--
-- Startup of the manager took 217776 microseconds.