I run Ubuntu in a hyper-V session.  It works very well and handy for getting screenshots. I’ve been using a 24.04 LTS for a while and decided I needed another one to test CyberPanel. i already have Webmin on my main one so wanted a clean Ubuntu so as not to mess Webmin.  It took ten minutes to setup then another 20 minutes to install 300+ updates.

Then I edited Grub to give me a fullscreen- 1920 x 1080.  You just edit /etc/default/grub with an editor run under sudo. I use Gedit but nano will do. Just change the line to this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=hyperv_fb:1920x1080"

followed by

sudo update-grub

and that should be it. Only it didn’t work in my new Ubuntu 24.04 LTS VM. I installed ifconfig from net-tools, connected to it from my Windows PC and copied grub across. I did the same with my older 24.04 LTS VM and compared the two grub files. Both identical yet one works fullscreen and the newer one doesn’t. Any ideas?