I finally found out the cause for this, still no idea about a proper solution. 
I am using vmware horizon to connect to a windows computer, it has a funcion 
called usb redirection that allows you to use your usb from the windows 
It seems that when vmware horizon is open, the usb devices are redirected there 
and my laptop doesn't see them, when I close it, everything works normally.
So I suppose that the issue can be closed. Thanks for your help

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  The device on /dev/sdx is not created when inserting new devices

Status in linux package in Ubuntu:

Bug description:
  I am on kubuntu xenial (upgraded from 15.10), from a couple of weeks I 
noticed that the pendrives i insert to my computer are detected but the devices 
under /dev are no longer created.
  I if reboot the pc with the pendrive already plugged in it works without 
issues. I'm suspecting from udev because of this text in syslog (full output in 
the summary)

  Jun  7 15:02:55 pc systemd-udevd[24747]: inotify_add_watch(9,
  /dev/sdb, 10) failed: No such file or directory

  I'm up to date on all the packages
  - linux-image-4.4.0-22-generic
  - udev - 229-4ubuntu6
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  jjuvanteny   2047 F.... pulseaudio
   /dev/snd/pcmC1D0p:   jjuvanteny   2047 F...m pulseaudio
   /dev/snd/controlC1:  jjuvanteny   2047 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=120e7a9e-4193-4d2d-a46e-6fdf0fa5b16c
  InstallationDate: Installed on 2015-03-27 (439 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
  MachineType: LENOVO 20DF004USP
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic 
root=UUID=c62be6bc-f11b-4970-8ee1-976bf2e7fb9d ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  Tags:  xenial
  Uname: Linux 4.4.0-22-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (47 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/08/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: J5ET41WW (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20DF004USP
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.product.name: 20DF004USP
  dmi.product.version: ThinkPad E550
  dmi.sys.vendor: LENOVO

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