I am running a Ubuntu machine (version 18.04.4) with VirtualBox. The screen resolution is locked on 800x600 and this is uncomfortable.
Like write on this post, I've already installed virtualbox additions :
sudo apt-get install virtualbox-guest-utils virtualbox-guest-x11 virtualbox-guest-dkms
When I restart the vm, I can change the screen resolution (View -> Virtual Screen 1 -> Resize to ...).
But my keyboard and my mouse don't worked except on lock screen. To resolve this problem, I followed this tutorial. And then I had to reboot the system.
But, even if I don't change anything, when I reboot the machine, the screen size come back to 800x600 and I cannot change the resolution anymore.
I checked if the packages were still installed (by running dpkg --list) and they were well installed. I tried to remove and reinstall them but it's not working either.
I tried to run (Devices -> Insert Guest Additions CD images...) but i've got this error
I did it like 4 times and i have the problem at each try. Any idea ?
