can't find /run/user/65534 in /etc/fstab

I have a version of xenial running on a VM (due to compatibility reasons) and whenever I boot it up, I get an error dialog that reads:

Error mount: can't find /run/user/65534 in /etc/fstab

and I was wondering what this is all about, why this shows up and how i get rid of it.

$ 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 installationUUID=6e415079-1461-4b10-bfb2-f2ea8742bcc8 /               ext4    errors=remount-ro 0       1# swap was on /dev/sda5 during installationUUID=fdcbb1a5-f6b9-4994-bae6-c4c97d2f6a1b none            swap    sw              0       0