nvim-lua
Ubuntu installation of neovim
In the documentation you have this
sudo add-apt-repository ppa:neovim-ppa/unstable -y
sudo apt update
sudo apt install make gcc ripgrep unzip git xclip neovim
but this will install from unstable packages not maintained by neovim,
which can be done with
sudo apt install neovim
The neovim version included in the stable packages is too old for kickstart, which requires at least 0.10.0
The last three ubuntu releases (24.02, 24.10, 25.04) have all neovim 0.9.5
try running :checkhealth and see if you get any version warnings.
Like dam9000 said. Some Linux distros (such as Arch Linux) use a rolling-release model, and packages are updated frequently, but some distros are not. Maintainers have to find a balance between new features and stability. Neovim hasn't reached 1.0 yet, so a lot of things maybe changed. If you're not comfortable with ppa, you can always download the binaries either .tar.gz or .appimage, or you can build neovim from the source.
but this will install from unstable packages not maintained by neovim,
which can be done with sudo apt install neovim
Neovim doesn't maintain that either, see https://github.com/neovim/neovim/issues/22790
