So
Ich habe probiert die Gasterweiterung über Gasterweiterung einlegen und mit:
sudo sh /media/>/VBOXADDITIONS_5.1.34_121010/VboxLinuxAdditions.run
zu installieren und dann kam das:
Verifying archive integrity... All good. Uncompressing VirtualBox 5.1.34 Guest Additions for Linux........... VirtualBox Guest Additions installer This system appears to have a version of the VirtualBox Guest Additions already installed. If it is part of the operating system and kept up-to-date, there is most likely no need to replace it. If it is not up-to-date, you should get a notification when you start the system. If you wish to replace it with this version, please do not continue with this installation now, but instead remove the current version first, following the instructions for the operating system. If your system simply has the remains of a version of the Additions you could not remove you should probably continue now, and these will be removed during installation. Do you wish to continue? [yes or no]
Ich wäre für eine Erläuterung dankbar.
Gruß Leunam555