sudo apt-get install virtualbox
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  virtualbox-dkms virtualbox-qt
Suggested packages:
  vde2 virtualbox-guest-additions-iso
The following NEW packages will be installed:
  virtualbox virtualbox-dkms virtualbox-qt
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 22.4 MB/43.7 MB of archives.
After this operation, 177 MB of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://dk.archive.ubuntu.com/ubuntu focal/multiverse amd64 virtualbox-dkms amd64 6.1.6-dfsg-1 [688 kB]
Get:2 http://dk.archive.ubuntu.com/ubuntu focal/multiverse amd64 virtualbox-qt amd64 6.1.6-dfsg-1 [21.7 MB]
Fetched 22.4 MB in 1s (15.3 MB/s)        
Selecting previously unselected package virtualbox-dkms.
(Reading database ... 186115 files and directories currently installed.)
Preparing to unpack .../virtualbox-dkms_6.1.6-dfsg-1_amd64.deb ...
Unpacking virtualbox-dkms (6.1.6-dfsg-1) ...
Selecting previously unselected package virtualbox.
Preparing to unpack .../virtualbox_6.1.6-dfsg-1_amd64.deb ...
Unpacking virtualbox (6.1.6-dfsg-1) ...
Selecting previously unselected package virtualbox-qt.
Preparing to unpack .../virtualbox-qt_6.1.6-dfsg-1_amd64.deb ...
Unpacking virtualbox-qt (6.1.6-dfsg-1) ...
Setting up virtualbox-dkms (6.1.6-dfsg-1) ...
Loading new virtualbox-6.1.6 DKMS files...
Building for 5.4.0-29-generic
Building initial module for 5.4.0-29-generic
Done.

vboxdrv.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.4.0-29-generic/updates/dkms/

vboxnetadp.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.4.0-29-generic/updates/dkms/

vboxnetflt.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.4.0-29-generic/updates/dkms/

depmod...

DKMS: install completed.
Setting up virtualbox (6.1.6-dfsg-1) ...
Created symlink /etc/systemd/system/multi-user.target.wants/vboxweb.service → /lib/systemd/system/vboxweb.service.
Job for vboxweb.service failed because the service did not take the steps required by its unit configuration.
See "systemctl status vboxweb.service" and "journalctl -xe" for details.
Setting up virtualbox-qt (6.1.6-dfsg-1) ...
Processing triggers for desktop-file-utils (0.24-1ubuntu2) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for systemd (245.4-4ubuntu3) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for shared-mime-info (1.15-1) ...