Как установить virtualbox на Ubuntu 19.10 (защитите начальную загрузку, не включенную)?

Я пытаюсь установить virtualbox на Ubuntu 19.10. Согласно этой странице, ошибка VirtualBox о безопасном подписании драйвера начальной загрузки была исправлена в версии 6.0 для Ubuntu. Однако у меня нет безопасной включенной начальной загрузки. Тем не менее я получаю предупреждение: The character device /dev/vboxdrv does not exist... You will not be able to start VMs until this problem is fixed:

$ sudo apt-get install virtualbox
$ VBoxManage --version
WARNING: The character device /dev/vboxdrv does not exist.
     Please install the virtualbox-dkms package and the appropriate
     headers, most likely linux-headers-generic.
$ sudo apt-get install virtualbox-dkms
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  virtualbox-dkms
0 upgraded, 1 newly installed, 0 to remove and 27 not upgraded.
Need to get 689 kB of archives.
After this operation, 5 702 kB of additional disk space will be used.
Get:1 http://no.archive.ubuntu.com/ubuntu eoan/multiverse amd64 virtualbox-dkms all 6.0.14-dfsg-1 [689 kB]
Fetched 689 kB in 1s (888 kB/s)         
Selecting previously unselected package virtualbox-dkms.
(Reading database ... 251996 files and directories currently installed.)
Preparing to unpack .../virtualbox-dkms_6.0.14-dfsg-1_all.deb ...
Unpacking virtualbox-dkms (6.0.14-dfsg-1) ...
Setting up virtualbox-dkms (6.0.14-dfsg-1) ...
Loading new virtualbox-6.0.14 DKMS files...
Building for 5.3.0-23-generic
Building initial module for 5.3.0-23-generic
Secure Boot not enabled on this system.
Done.

vboxdrv.ko:
Running module version sanity check.
modinfo: ERROR: missing module or filename.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.3.0-23-generic/updates/dkms/

vboxnetadp.ko:
Running module version sanity check.
modinfo: ERROR: missing module or filename.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.3.0-23-generic/updates/dkms/

vboxnetflt.ko:
Running module version sanity check.
modinfo: ERROR: missing module or filename.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.3.0-23-generic/updates/dkms/

vboxpci.ko:
Running module version sanity check.
modinfo: ERROR: missing module or filename.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.3.0-23-generic/updates/dkms/

depmod...

DKMS: install completed.
$ VBoxManage --version
WARNING: The character device /dev/vboxdrv does not exist.
     Please install the virtualbox-dkms package and the appropriate
     headers, most likely linux-headers-generic.

     You will not be able to start VMs until this problem is fixed.
6.0.14_Ubuntur132055