我正在运行 Ubuntu 服务器 16.04.3 LTS，主要用于家庭内部的文件共享。昨天，我的妻子无法写入共享文件夹（从这里的 iMac）。当我在服务器上检查该共享文件夹的权限时，所有者是Debian-exim。我将其改回来，现在一切又恢复正常了。一开始，怎么可能Debian-exim成为该文件夹的所有者？我从来没有这样做过，最近也没有对系统进行任何更改。
我附上了更正前后的所有权截图。
非常奇怪，我希望有人知道发生了什么。
ralph@NAS:~$ sudo nano /etc/samba/smb.conf
[sudo] password for ralph:
ralph@NAS:~$ cd /mnt/main1
ralph@NAS:/mnt/main1$ ls -la
total 291956
drwxrwxr-x 9 ralph users 4096 Feb 7 00:15 .
drwxr-xr-x 8 root root 4096 Jan 20 11:09 ..
drwxr-s--- 10 ralph users 4096 Jan 30 20:36 data
drwxrwsr-x 22 root users 4096 Jan 30 20:01 fotoalbum
drwxr-sr-x 6 ralph users 4096 Aug 25 16:02 homevideos
drwxrwxr-x 2 root users 16384 Jun 20 2017 lost+found
drwxr-s--- 12 Debian-exim users 4096 Jan 9 08:51 affecteddir
drwxr-sr-x 18 ralph users 4096 Aug 25 19:07 mediacards
-rw------- 1 root root 298910866 Feb 7 00:15 snapraid.content
-rw------- 1 ralph ralph 0 Feb 7 00:15 snapraid.content.lock
drwxr-xr-x 2 root root 4096 Feb 4 13:27 temp
ralph@NAS:/mnt/main1$ sudo chown liesbeth:users /mnt/main1/affecteddir -R
ralph@NAS:/mnt/main1$ sudo chmod 750 /mnt/main1/affecteddir -R
ralph@NAS:/mnt/main1$ ls -la
total 291956
drwxrwxr-x 9 ralph users 4096 Feb 7 00:15 .
drwxr-xr-x 8 root root 4096 Jan 20 11:09 ..
drwxr-s--- 10 ralph users 4096 Jan 30 20:36 data
drwxrwsr-x 22 root users 4096 Jan 30 20:01 fotoalbum
drwxr-sr-x 6 ralph users 4096 Aug 25 16:02 homevideos
drwxrwxr-x 2 root users 16384 Jun 20 2017 lost+found
drwxr-s--- 12 liesbeth users 4096 Jan 9 08:51 affecteddir
drwxr-sr-x 18 ralph users 4096 Aug 25 19:07 mediacards
-rw------- 1 root root 298910866 Feb 7 00:15 snapraid.content
-rw------- 1 ralph ralph 0 Feb 7 00:15 snapraid.content.lock
drwxr-xr-x 2 root root 4096 Feb 4 13:27 temp
ralph@NAS:/mnt/main1$ sudo service smbd restart
ralph@NAS:/mnt/main2$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 7.7G 0 7.7G 0% /dev
tmpfs 1.6G 9.5M 1.6G 1% /run
/dev/sda1 132G 3.1G 122G 3% /
tmpfs 7.7G 0 7.7G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 7.7G 0 7.7G 0% /sys/fs/cgroup
/dev/sde1 3.6T 2.2T 1.5T 60% /mnt/camera
tmpfs 1.6G 0 1.6G 0% /run/user/1000
/dev/mapper/main1-enc 3.6T 1.9T 1.6T 55% /mnt/main1
/dev/mapper/main2-enc 3.6T 2.4T 1.1T 70% /mnt/main2
/dev/mapper/parity-enc 3.6T 2.5T 984G 72% /mnt/parity
192.168.1.12:/mnt/usb 4.6T 3.3T 1.1T 77% /mnt/usb5tb