Output from following commands:

  sudo blkid
  swapon -s
  printf "x\np\n" | sudo fdisk /dev/sda
  ls -l /run/systemd/generator/

--

Welcome to Ubuntu Xenial Xerus (development branch) (GNU/Linux 4.4.0-16-generic x86_64)

$ sudo blkid
/dev/mmcblk0: PTUUID="964e28b5-d6c2-47c6-badd-de7725281f53" PTTYPE="gpt"
/dev/mmcblk0p1: UUID="8F05-DBA1" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="f13ded99-6623-4642-9319-5c7da84f93b4"
/dev/mmcblk0p2: UUID="040427a5-f2c1-481a-8cfc-6e9667f94855" TYPE="ext4" PARTUUID="3b78057b-58b5-449f-9607-ba173cd7f438"
/dev/mmcblk0p3: UUID="5d1798c3-4e4a-4c3c-842e-e929fbeceb85" TYPE="swap" PARTUUID="ae598300-c995-4ffb-a8f6-48a7758015ae"

$ swapon -s
Filename                                Type            Size    Used    Priority
/dev/mmcblk0p3                          partition       4046844 0       -1

$ printf "x\np\n" | sudo fdisk /dev/sda
fdisk: cannot open /dev/sda: No such file or directory

$ printf "x\np\n" | sudo fdisk /dev/sdb
fdisk: cannot open /dev/sdb: No such file or directory

$ printf "x\np\n" | sudo fdisk /dev/sdc
fdisk: cannot open /dev/sdc: No such file or directory

$ ls -l /run/systemd/generator/
total 16
-rw-r--r-- 1 root root 374 Mar 31 13:47 boot-efi.mount
drwxr-xr-x 2 root root  60 Mar 31 13:47 cryptsetup.target.requires
drwxr-xr-x 2 root root  60 Mar 31 13:47 dev-disk-by\x2duuid-5d1798c3\x2d4e4a\x2d4c3c\x2d842e\x2de929fbeceb85.device.wants
drwxr-xr-x 2 root root  60 Mar 31 13:47 dev-mapper-cryptswap1.device.d
drwxr-xr-x 2 root root  60 Mar 31 13:47 dev-mapper-cryptswap1.device.requires
-rw-r--r-- 1 root root 188 Mar 31 13:47 dev-mapper-cryptswap1.swap
drwxr-xr-x 2 root root  60 Mar 31 13:47 hwclock.service.d
drwxr-xr-x 2 root root  80 Mar 31 13:47 local-fs.target.requires
drwxr-xr-x 2 root root  60 Mar 31 13:47 local-fs.target.wants
-rw-r--r-- 1 root root 277 Mar 31 13:47 -.mount
drwxr-xr-x 2 root root  60 Mar 31 13:47 multi-user.target.wants
drwxr-xr-x 2 root root  60 Mar 31 13:47 networking.service.d
drwxr-xr-x 2 root root  60 Mar 31 13:47 remote-fs.target.d
drwxr-xr-x 2 root root  60 Mar 31 13:47 sendsigs.service.d
drwxr-xr-x 2 root root  60 Mar 31 13:47 swap.target.requires
-rw-r--r-- 1 root root 947 Mar 31 13:47 <email address hidden>
drwxr-xr-x 2 root root  60 Mar 31 13:47 umountfs.service.d
drwxr-xr-x 2 root root  60 Mar 31 13:47 umountnfs.service.d

$ printf "x\np\n" | sudo fdisk /dev/mmcblk0

Disk /dev/mmcblk0: 58.2 GiB, 62537072640 bytes, 122142720 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 964E28B5-D6C2-47C6-BADD-DE7725281F53
First LBA: 34
Last LBA: 122142686
Alternative LBA: 122142719
Partition entries LBA: 2
Allocated partition entries: 128

Device             Start       End   Sectors Type-UUID                            UUID                                 Name            Attrs
/dev/mmcblk0p1      2048   1050623   1048576 C12A7328-F81F-11D2-BA4B-00A0C93EC93B F13DED99-6623-4642-9319-5C7DA84F93B4 EFI System Partition
                                                                                                                                       
/dev/mmcblk0p2   1050624 114046975 112996352 0FC63DAF-8483-4772-8E79-3D69D8477DE4 3B78057B-58B5-449F-9607-BA173CD7F438                 
/dev/mmcblk0p3 114046976 122140671   8093696 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F AE598300-C995-4FFB-A8F6-48A7758015AE