I am using VirtualBox since years with a lot of VMs (Win and Linux, mostly Ubuntu). Everything worked fine for me. Until today.
All of the sudden the UI doesn't start any more. This is what I get:
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:~$ virtualbox
VirtualBox: Error -610 in supR3HardenedMainInitRuntime!
VirtualBox: dlopen("/usr/lib/virtualbox/VBoxRT.so",) failed: <NULL>
VirtualBox: Tip! It may help to reinstall VirtualBox.
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:~ uname -a
Linux g1406 4.4.0-128-generic #154-Ubuntu SMP Fri May 25 14:15:18 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux]
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:~$ cat /var/log/kern.log |grep -i vbox
Jun 20 14:49:36 ltr-16 kernel: [ 2.087124] vboxdrv: loading out-of-tree module taints kernel.
Jun 20 14:49:36 ltr-16 kernel: [ 2.087254] vboxdrv: module verification failed: signature and/or required key missing - tainting kernel
Jun 20 14:49:36 ltr-16 kernel: [ 2.089484] vboxdrv: Found 8 processor cores
Jun 20 14:49:36 ltr-16 kernel: [ 2.107982] vboxdrv: TSC mode is Invariant, tentative frequency 3498977920 Hz
Jun 20 14:49:36 ltr-16 kernel: [ 2.107984] vboxdrv: Successfully loaded version 5.1.36 (interface 0x002a0000)
Jun 20 14:49:36 ltr-16 kernel: [ 2.310884] VBoxNetFlt: Successfully started.
Jun 20 14:49:36 ltr-16 kernel: [ 2.312017] VBoxNetAdp: Successfully started.
Jun 20 14:49:36 ltr-16 kernel: [ 2.313446] VBoxPciLinuxInit
Jun 20 14:49:36 ltr-16 kernel: [ 2.314041] vboxpci: cannot load pci-stub
Jun 20 14:49:36 ltr-16 kernel: [ 2.314042] vboxpci: IOMMU not found (not registered)
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:~$ lsmod |grep -i vbox
vboxpci 24576 0
vboxnetadp 28672 0
vboxnetflt 28672 0
vboxdrv 458752 3 vboxnetadp,vboxnetflt,vboxpci
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:~$ sudo /etc/init.d/vboxdrv setup
sudo: /etc/init.d/vboxdrv: Befehl nicht gefunden
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:~$ sudo apt-get install --reinstall linux-headers-4.4.0-128-generic
(seems to work...)
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:~$ sudo /sbin/rcvboxdrv setup
vboxdrv.sh: Stopping VirtualBox services.
vboxdrv.sh: Building VirtualBox kernel modules.
vboxdrv.sh: Starting VirtualBox services.
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:~$ sudo apt-get purge -y "^virtualbox-.*"
:~$ sudo rmmod vboxpci vboxnetadp vboxnetflt vboxdrv
:~$ sudo apt-get purge -y virtualbox virtualbox-dkms virtualbox-qt
:~$ sudo apt-get autoremove -y && sudo apt-get autoclean -y && sudo apt-get clean -y
:~$ sudo apt-get update
:~$ sudo apt-get dist-upgrade -y
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:~$ sudo apt-get install -y virtualbox
:~$ sudo dpkg --install Downloads/virtualbox-5.1_5.1.38-122592~Ubuntu~xenial_amd64.deb
:~$ sudo dpkg --install Downloads/virtualbox-5.2_5.2.12-122591~Ubuntu~xenial_amd64.deb
:~$ sudo dpkg --install Downloads/virtualbox-5.1_5.1.36-122089~Ubuntu~xenial_amd64.deb