ubuntu@ubuntu:~$ sudo apt-get install kpartx
Reading package lists... Done
Building dependency tree       
Reading state information... Done
kpartx is already the newest version (0.5.0+git1.656f8865-5ubuntu2).
The following packages were automatically installed and are no longer required:
  lib32z1 libc6-i386
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 147 not upgraded.
ubuntu@ubuntu:~$ kpartx -a /dev/loop1
/dev/mapper/control: open failed: Permission denied
Failure to communicate with kernel device-mapper driver.
Incompatible libdevmapper (unknown version) and kernel driver (unknown version).
device mapper prerequisites not met
ubuntu@ubuntu:~$ sudo kpartx -a /dev/loop1
read error, sector 0
llseek error
llseek error
llseek error
ubuntu@ubuntu:~$