I installed Ubuntu 18.04 on the cleaned partition.
Strange problems.
I reinstalled the programs and "missing" libraries.
Programs:
Virtualbox, smplayer, vlc, grub-customizer, gparted.

everything works now :)

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to qtbase-opensource-src in
Ubuntu.
https://bugs.launchpad.net/bugs/1791166

Title:
  Programs using the libqt5gui5 library do not start.

Status in qtbase-opensource-src package in Ubuntu:
  Incomplete

Bug description:
  Programs using the libqt5gui5 library do not start.
  Running in the terminal displays the message:
  "VirtualBox: supR3HardenedMainGetTrustedMain: 
dlopen("/usr/lib/virtualbox/VirtualBox.so",) failed: libQt5Gui.so.5: cannot 
open shared object file: No such file or directory"
  or
  "smplayer: error while loading shared libraries: libQt5Widgets.so.5: cannot 
open shared object file: No such file or directory"
  My distribution is Ubuntu 18.04.1.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1791166/+subscriptions

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