我有一个在 VM 上运行的版本xenial（由于兼容性原因），每当我启动它时，都会出现一个错误对话框，内容如下：
错误挂载：在 /etc/fstab 中找不到 /run/user/65534
我想知道这是怎么回事，为什么会出现这种情况以及如何摆脱它。
$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda1 during installation
UUID=6e415079-1461-4b10-bfb2-f2ea8742bcc8 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=fdcbb1a5-f6b9-4994-bae6-c4c97d2f6a1b none swap sw 0 0
--
$ grep nobody /etc/passwd
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
--
$ sudo grep nobody /etc/shadow
nobody:*:17953:0:99999:7:::