root@vps:~# sudo apt-get install tree
Reading package lists... Done
Building dependency tree
Reading state information... Done
tree is already the newest version (1.8.0-1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up zfsutils-linux (0.8.3-1ubuntu12.4) ...
modprobe: FATAL: Module zfs not found in directory /lib/modules/5.9.0
zfs-import-scan.service is a disabled or a static unit, not starting it.
zfs-import-scan.service is a disabled or a static unit, not starting it.
Job for zfs-mount.service failed because the control process exited with error code.
See "systemctl status zfs-mount.service" and "journalctl -xe" for details.
invoke-rc.d: initscript zfs-mount, action "start" failed.
● zfs-mount.service - Mount ZFS filesystems
     Loaded: loaded (/lib/systemd/system/zfs-mount.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Mon 2020-11-09 21:38:55 UTC; 20ms ago
       Docs: man:zfs(8)
    Process: 4065169 ExecStart=/sbin/zfs mount -a (code=exited, status=1/FAILURE)
   Main PID: 4065169 (code=exited, status=1/FAILURE)

Nov 09 21:38:55 vps systemd[1]: Starting Mount ZFS filesystems...
Nov 09 21:38:55 vps zfs[4065169]: /dev/zfs and /proc/self/mounts are required.
Nov 09 21:38:55 vps zfs[4065169]: Try running 'udevadm trigger' and 'mount -t proc proc /proc' as root.
Nov 09 21:38:55 vps systemd[1]: zfs-mount.service: Main process exited, code=exited, status=1/FAILURE
Nov 09 21:38:55 vps systemd[1]: zfs-mount.service: Failed with result 'exit-code'.
Nov 09 21:38:55 vps systemd[1]: Failed to start Mount ZFS filesystems.
dpkg: error processing package zfsutils-linux (--configure):
 installed zfsutils-linux package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of zfs-zed:
 zfs-zed depends on zfsutils-linux (>= 0.8.3-1ubuntu12.4); however:
  Package zfsutils-linux is not configured yet.

dpkg: error processing package zfs-zed (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 zfsutils-linux
 zfs-zed
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@vps:~#
--