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Tips & Tricks
When grub screen appears, you can press the c key and then type lsfonts to get a list
of the font names that have been loaded.
When grub screen appears, you can press the c key and then type vbeinfo or videoinfo to
see all the available resolutions. For example "1920x1080x32".
After picking a resolution like "1920x1080x32" from the previous step, edit /etc/default/grub
and set your custom resolution like GRUB_GFXMODE="1920x1080x32"
A good way of testing the theme without having to restart your computer is to have installed your own linux virtual machine.
You can install virtual box with sudo apt install virtualbox
Download a linux ISO of your preference, I like lubuntu.
Then create a virtual machine in virtualbox and install the ISO onto it.
If when checking available grub resolutions, "1920x1080x..." does not appear, you can add it to your virtual machine called "MyComputer" with this command: vboxmanage setextradata "MyComputer" "CustomVideoMode1" "1920x1080x32".
Now it should appear as part of the vbeinfo command output.