virtualbox.org

I was deinstalling Virtualbox 5.0.26 on a Ubuntu 14.04 system and then installing 5.1.2. When I am running virtualbox I am getting the error message "Failed to acquire the VirtualBox COM object".

I was not able to fix that, so I went back to 5.0.26 and getting now the same error message.

Is there any advice or tip to overcome with that problem.

Post the /var/log/vbox-install.log ( as an attachment )

here is the /var/log/vbox-install.log: file was to big for uploading, so I use the first part
if I should look for an specific part, let me know

I don't see a specific error that would point to the cause but there is something else I would like you to try.

Remove VirtualBox again and reboot the host to make sure everything is gone, then install again with dpkg instead of the software center that Ubuntu uses and record the terminal output and post here.

I did remove virtualbox and installed it new with "sudo apt-get install virtualbox-5.1" but still virtualbox is not running.

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
virtualbox-5.1
0 upgraded, 1 newly installed, 0 to remove and 7 not upgraded.
Need to get 0 B/71,7 MB of archives.
After this operation, 173 MB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously unselected package virtualbox-5.1.
(Reading database ... 822192 files and directories currently installed.)
Preparing to unpack .../virtualbox-5.1_5.1.4-110228~Ubuntu~trusty_amd64.deb ...
Unpacking virtualbox-5.1 (5.1.4-110228~Ubuntu~trusty) ...
Processing triggers for ureadahead (0.100.0-16) ...
ureadahead will be reprofiled on next reboot
Processing triggers for hicolor-icon-theme (0.13-1) ...
Processing triggers for shared-mime-info (1.2-0ubuntu3) ...
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'
Unknown media type in type 'uri/mms'
Unknown media type in type 'uri/mmst'
Unknown media type in type 'uri/mmsu'
Unknown media type in type 'uri/pnm'
Unknown media type in type 'uri/rtspt'
Unknown media type in type 'uri/rtspu'
Processing triggers for mime-support (3.54ubuntu1.1) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu2) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu1) ...
Processing triggers for bamfdaemon (0.5.1+14.04.20140409-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Setting up virtualbox-5.1 (5.1.4-110228~Ubuntu~trusty) ...
addgroup: The group `vboxusers' already exists as a system group. Exiting.
Processing triggers for libc-bin (2.19-0ubuntu6.9) ...

But that is not what I asked for. There is a reason why I would like to see the install done with dpkg and that is to eliminate the Ubuntu software center or their other package managers from interfering.