Virtualbox kernel driver problem on ubuntu 20.04 (updated from 16.04)

i installed virtualbox (Version 6.1.22 r144080 (Qt5.12.8)) on ubuntu 20.04 focal. after installed virtual box i got this error on lunching VM's.

Kernel driver not installed (rc=-1908)
The VirtualBox Linux kernel driver is either not loaded or not set up
 correctly. Please try setting it up again by executing
 
 '/sbin/vboxconfig'
  as root.

If your system has EFI Secure Boot enabled you may also need to sign the kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) before you can load them. Please see your Linux system's documentation for more information.

where: suplibOsInit what: 3 VERR_VM_DRIVER_NOT_INSTALLED (-1908) - The support driver is not installed. On linux, open returned ENOENT.

i'm using this code for fix the problem:

sudo /sbin/vboxconfig

and get this output:

vboxdrv.sh: Stopping VirtualBox services.
vboxdrv.sh: Starting VirtualBox services.
vboxdrv.sh: Building VirtualBox kernel modules.
This system is currently not set up to build kernel modules.
Please install the Linux kernel "header" files matching the current kernel
for adding new hardware support to the system.
The distribution packages containing the headers are probably:
    linux-headers-generic linux-headers-4.4.0-104-generic
This system is currently not set up to build kernel modules.
Please install the Linux kernel "header" files matching the current kernel
for adding new hardware support to the system.
The distribution packages containing the headers are probably:
    linux-headers-generic linux-headers-4.4.0-104-generic

There were problems setting up VirtualBox.  To re-start the set-up process, run
  /sbin/vboxconfig
`as root.  If your system is using EFI Secure Boot you may need to sign the
kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) before you can load
them. Please see your Linux system's documentation for more information.

i have two os. windows10 and ubuntu 20.04 with grub. i'm checking bios option and secure bot is disabled. also checking windows and no problem with boot option in windows. and not installed with UEFI style.

i'm trying to install

linux-headers-generic linux-headers-4.4.0-104-generic

but it got this error:

E: Package 'linux-headers-4.4.0-104-generic' has no installation candidate

how can i fix this problem?

output of uname -r

4.4.0-104-generic

output of dpkg -l | egrep linux-'[g|h|i|m]'

 ii  binutils-x86-64-linux-gnu                     2.34-6ubuntu1.1     
 amd64        GNU binary utilities, for x86-64-linux-gnu target ii 
 linux-generic                                 5.4.0.74.77             
 amd64        Complete Generic Linux kernel and headers ii 
 linux-headers-5.4.0-73                        5.4.0-73.82             
 all          Header files related to Linux kernel version 5.4.0 ii 
 linux-headers-5.4.0-73-generic                5.4.0-73.82             
 amd64        Linux kernel headers for version 5.4.0 on 64 bit x86 SMP
 ii  linux-headers-5.4.0-74                        5.4.0-74.83         
 all          Header files related to Linux kernel version 5.4.0 ii 
 linux-headers-5.4.0-74-generic                5.4.0-74.83             
 amd64        Linux kernel headers for version 5.4.0 on 64 bit x86 SMP
 ii  linux-headers-5.4.0-74-lowlatency             5.4.0-74.83         
 amd64        Linux kernel headers for version 5.4.0 on 64 bit x86 SMP
 ii  linux-headers-generic                         5.4.0.74.77         
 amd64        Generic Linux kernel headers ii  linux-headers-lowlatency
 5.4.0.74.77                                                                 amd64        lowlatency Linux kernel headers rc 
 linux-image-4.15.0-143-generic                4.15.0-143.147          
 amd64        Signed kernel image generic rc 
 linux-image-4.4.0-101-generic                 4.4.0-101.124           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-103-generic                 4.4.0-103.126           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP ii
 linux-image-4.4.0-104-generic                 4.4.0-104.127           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-109-generic                 4.4.0-109.132           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-112-generic                 4.4.0-112.135           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-116-generic                 4.4.0-116.140           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-119-generic                 4.4.0-119.143           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-121-generic                 4.4.0-121.145           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-127-generic                 4.4.0-127.153           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-128-generic                 4.4.0-128.154           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-130-generic                 4.4.0-130.156           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-133-generic                 4.4.0-133.159           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-134-generic                 4.4.0-134.160           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-137-generic                 4.4.0-137.163           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-138-generic                 4.4.0-138.164           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-139-generic                 4.4.0-139.165           
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-157-generic                 4.4.0-157.185           
 amd64        Signed kernel image generic rc 
 linux-image-4.4.0-169-generic                 4.4.0-169.198           
 amd64        Signed kernel image generic rc 
 linux-image-4.4.0-174-generic                 4.4.0-174.204           
 amd64        Signed kernel image generic rc 
 linux-image-4.4.0-176-generic                 4.4.0-176.206           
 amd64        Signed kernel image generic rc 
 linux-image-4.4.0-179-generic                 4.4.0-179.209           
 amd64        Signed kernel image generic rc 
 linux-image-4.4.0-21-generic                  4.4.0-21.37             
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-210-generic                 4.4.0-210.242           
 amd64        Signed kernel image generic rc 
 linux-image-4.4.0-97-generic                  4.4.0-97.120            
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP rc
 linux-image-4.4.0-98-generic                  4.4.0-98.121            
 amd64        Linux kernel image for version 4.4.0 on 64 bit x86 SMP ii
 linux-image-5.4.0-73-generic                  5.4.0-73.82             
 amd64        Signed kernel image generic ii 
 linux-image-5.4.0-74-generic                  5.4.0-74.83             
 amd64        Signed kernel image generic rc 
 linux-image-extra-4.4.0-101-generic           4.4.0-101.124           
 amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-103-generic          
 4.4.0-103.126                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP ii  linux-image-extra-4.4.0-104-generic          
 4.4.0-104.127                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-109-generic          
 4.4.0-109.132                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-112-generic          
 4.4.0-112.135                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-116-generic          
 4.4.0-116.140                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-119-generic          
 4.4.0-119.143                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-121-generic          
 4.4.0-121.145                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-127-generic          
 4.4.0-127.153                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-128-generic          
 4.4.0-128.154                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-130-generic          
 4.4.0-130.156                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-133-generic          
 4.4.0-133.159                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-134-generic          
 4.4.0-134.160                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-137-generic          
 4.4.0-137.163                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-138-generic          
 4.4.0-138.164                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-139-generic          
 4.4.0-139.165                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-21-generic            4.4.0-21.37 
 amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-97-generic            4.4.0-97.120
 amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-image-extra-4.4.0-98-generic            4.4.0-98.121
 amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP ii  linux-image-generic                           5.4.0.74.77 
 amd64        Generic Linux kernel image rc 
 linux-modules-4.15.0-143-generic              4.15.0-143.147          
 amd64        Linux kernel extra modules for version 4.15.0 on 64 bit
 x86 SMP rc  linux-modules-4.4.0-157-generic              
 4.4.0-157.185                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-4.4.0-169-generic              
 4.4.0-169.198                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-4.4.0-174-generic              
 4.4.0-174.204                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-4.4.0-176-generic              
 4.4.0-176.206                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-4.4.0-179-generic              
 4.4.0-179.209                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-4.4.0-210-generic              
 4.4.0-210.242                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP ii  linux-modules-5.4.0-73-generic                5.4.0-73.82 
 amd64        Linux kernel extra modules for version 5.4.0 on 64 bit
 x86 SMP ii  linux-modules-5.4.0-74-generic                5.4.0-74.83 
 amd64        Linux kernel extra modules for version 5.4.0 on 64 bit
 x86 SMP rc  linux-modules-extra-4.15.0-143-generic       
 4.15.0-143.147                                                              amd64        Linux kernel extra modules for version 4.15.0 on 64 bit
 x86 SMP rc  linux-modules-extra-4.4.0-157-generic        
 4.4.0-157.185                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-extra-4.4.0-169-generic        
 4.4.0-169.198                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-extra-4.4.0-174-generic        
 4.4.0-174.204                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-extra-4.4.0-176-generic        
 4.4.0-176.206                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-extra-4.4.0-179-generic        
 4.4.0-179.209                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP rc  linux-modules-extra-4.4.0-210-generic        
 4.4.0-210.242                                                               amd64        Linux kernel extra modules for version 4.4.0 on 64 bit
 x86 SMP ii  linux-modules-extra-5.4.0-73-generic          5.4.0-73.82 
 amd64        Linux kernel extra modules for version 5.4.0 on 64 bit
 x86 SMP ii  linux-modules-extra-5.4.0-74-generic          5.4.0-74.83 
 amd64        Linux kernel extra modules for version 5.4.0 on 64 bit
 x86 SMP

Make sure your system is fully updated and that old, obsolete, kernel aren't in the way:

sudo apt update && sudo apt full-upgrade && sudo apt autoremove

If no errors are reported then proceed to install what vboxconfig seems to be missing:

sudo apt install build-essential linux-kernel-headers

Finally, it should at this point be able to run the script correctly:

sudo /sbin/vboxconfig