Seems to be related to the virtualbox guest additions kernel moduls. Was able to restore grub via https://help.ubuntu.com/community/Grub2/Installing#via_ChRoot . Afterwards it was not possible to install the general kernel package. Only after I removed the virtualbox guest additions hwe I was able to install the new kernel that came with 19.10.
Seems to be related to the virtualbox guest additions kernel moduls. Was able to restore grub via https:/ /help.ubuntu. com/community/ Grub2/Installin g#via_ChRoot . Afterwards it was not possible to install the general kernel package. Only after I removed the virtualbox guest additions hwe I was able to install the new kernel that came with 19.10.