[Solved] Debian guest won't go in full screen any more

[emil78]

I have debian stretch guest machine. I updated the guest machine and also updated virtualbox to the current version 6.0.4. But guest machine won't go in full screen any more. If i try to install new guest additions i get:

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Verifying archive integrity... All good.
Uncompressing VirtualBox 6.0.4 Guest Additions for Linux........
VirtualBox Guest Additions installer
Removing installed version 6.0.4 of VirtualBox Guest Additions...
Copying additional installer modules ...
Installing additional modules ...
VirtualBox Guest Additions: Building the VirtualBox Guest Additions kernel 
modules.  This may take a while.
VirtualBox Guest Additions: To build modules for other installed kernels, run
VirtualBox Guest Additions:   /sbin/rcvboxadd quicksetup <version>
VirtualBox Guest Additions: Kernel headers not found for target kernel 
4.9.0-8-amd64. Please install them and execute
  /sbin/rcvboxadd setup

Also, if i run 'lsmod | grep vbox' i don't get any results, which mean no vbox modules are loaded.

[socratis]

VirtualBox Guest Additions: Kernel headers not found for target kernel
4.9.0-8-amd64. Please install them and execute
  /sbin/rcvboxadd setup

I believe the error message is clear. Which part you don't understand? You're missing the headers for your current kernel.

[emil78]

How to install the headers? If i run 'apt update' and then 'apt dist-upgrade' it shows that no new updates need to be installed.

[socratis]

If you have never installed the headers, there's going to be nothing to update, so that's not surprising. I use the following command to get the correct headers:

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apt-get install kernel-headers-$(uname -r) kernel-devel-$(uname -r)

But this is mostly a Debian question, not a VirtualBox one...

[emil78]

Installing the headers fixed the problem. Thanks.

[socratis]

Glad you got it going. Marking as [Solved].

[umairahmedshah]

The command contains

linux-headers

instead of

kernel-headers

I ran the following in my terminal.

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apt-get install linux-headers-$(uname -r)

[leonardopereira]

I ran the following in my terminal.

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apt-get install linux-headers-$(uname -r)

Worked fine for me using sparkylinux in virtualbox 6.1.16. Thanks a lot.