# /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=57c38326-ffdc-427f-98a7-53a2c26d33c1 / ext4 errors=remount-ro 0 1
# /mnt/files was on /dev/sda6 during installation
UUID=ef77e42b-aff1-4bbf-b552-79e1e73e287b /mnt/files ext4 defaults 0 2
# swap was on /dev/sda5 during installation
UUID=d28d6fc1-7a65-4292-8c9f-80cfe94fe668 none swap sw 0 0
/dev/disk/by-uuid/cf6e875d-196b-4886-9d66-f6b0658430ed /mnt/files auto nosuid,nodev,nofail,x-gvfs-show 0 0
/dev/disk/by-uuid/cb0256ba-b2ae-4077-abb3-bce5d54577a7 /mnt/cb0256ba-b2ae-4077-abb3-bce5d54577a7 auto nosuid,nodev,nofail,x-gvfs-show 0 0
Zmieniłem kod fstab na poniższy i problem już nie występuje 
# /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=57c38326-ffdc-427f-98a7-53a2c26d33c1 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=d28d6fc1-7a65-4292-8c9f-80cfe94fe668 none swap sw 0 0
